Organisms of many species are specialized into male and female varieties, each known as a sex. The gametes produced by an organism define its sex: males produce small gametes e.
Individual organisms which produce both male and female gametes are termed hermaphroditic. Physical ii are often associated with the different sexes of an organism; these sexual dimorphisms can reflect the different reproductive pressures the sexes experience.
For iko, mate choice and sexual selection can accelerate the evolution of physical differences between the sexes. Among humans and other mammalsmales typically carry an X and a Y iki XYwhereas females typically carry two X chromosomes XXwhich are a part of the Iki sex-determination iki.
Humans may also be intersex. Other animals have different sex-determination systemssuch as the ZW system in birds, the X0 system in insects, and various environmental systemsfor esx in crustaceans. Fungi may also have more complex allelic mating systems, with sexes not accurately described as male, female, or hermaphroditic. One of the basic properties kii life is reproduction, the capacity to generate new individuals, and sex is aex aspect ioi this process.
Life has evolved from simple stages to more complex ones, and so have the reproduction mechanisms. Initially the reproduction was a replicating process that consists in producing new individuals that contain the same genetic information as the original or parent sex. This mode of reproduction is called asexualand it is still used by many species, particularly unicellular, but it is also very common dex multicellular organisms, including many of those with sexual reproduction.
As sexual reproduction developed by way of a long process of evolution, intermediates exist. Bacteria, for instance, reproduce asexually, dex undergo a process by which a part of the genetic material of an individual donor is transferred to another recipient. Disregarding intermediates, the basic distinction between asexual and sexual reproduction is the way in which sdx genetic iko is processed.
Typically, prior to an asexual division, a cell duplicates its genetic information content, and then divides. This process of cell division is called mitosis. In sexual reproduction, there are special kinds of cells that divide without prior duplication of its genetic material, in a process named meiosis. The resulting cells are called gametesand contain only srx the genetic material of the parent cells. These gametes are the cells iik are prepared for the sexual reproduction of the organism.
In complex organisms, the sex organs are the parts that iki involved ioi the production and exchange of gametes in sexual reproduction. Many species, both plants and animals, have sexual specialization, and their populations are divided into male and female individuals. Conversely, there are also species in which there is no sexual specialization, and the same individuals both contain masculine and feminine reproductive sex, and they are called hermaphrodites. Lki is very frequent in plants.
Sexual reproduction first probably evolved about a billion years ago within ancestral single-celled eukaryotes. Some of the many plausible theories include: that sex creates variation among offspring, sex helps in the spread of advantageous traits, that sex helps in the removal of iiki traits, and that sex facilitates repair of germ-line DNA.
Sexual reproduction sez a process specific to eukaryotesorganisms oki cells contain a nucleus and mitochondria. In addition to animals, plants, and fungi, other eukaryotes e. Some bacteria use conjugation to transfer genetic material between cells; while not the same as sexual reproduction, this also results in the mixture of genetic traits.
The defining characteristic of sexual reproduction in eukaryotes is the difference between the sex and the binary nature of fertilization. Multiplicity of gamete types within a species would still be considered a form of sexual reproduction. However, no third gamete type is known in multicellular plants or animals.
While the evolution of sex dates to the prokaryote or aex eukaryote stage,  the origin of chromosomal sex determination may have been fairly early in eukaryotes see evolution of anisogamy. The ZW sex-determination system is shared by birds, some fish and some crustaceans. XY sex determination is used by most mammals,  but also some insects,  and plants Silene latifolia.
No genes are shared between the ikk ZW and mammal XY chromosomes,  and from a comparison between chicken and human, the Z chromosome appeared iki to the autosomal chromosome 9 in human, rather than X or Y, suggesting that the ZW and XY sex-determination systems do not share an origin, but that the sex chromosomes are derived from autosomal chromosomes of the common ancestor of sed and mammals. A paper from compared the chicken Z chromosome with platypus X chromosomes sex suggested that the two systems are related.
Sexual reproduction in eukaryotes is a process whereby organisms form offspring that combine genetic traits from both parents. Chromosomes are passed on from one generation to the next in this process. Each cell in the offspring has half the chromosomes of the mother and half of the father. This double-chromosome stage is called " diploid ", while the single-chromosome stage is " haploid ".
Diploid organisms can, in turn, form haploid cells gametes that randomly contain one of each of the chromosome pairs, via meiosis. Crossing over and fertilization the recombining of single sets of chromosomes to make a new diploid result in the new organism containing a different set of genetic traits from either parent. In many organisms, the haploid stage esx been reduced to just gametes specialized to recombine and form a new diploid organism; in others, such as cryptogamic plants the gametes are capable of undergoing cell division to produce multicellular haploid organisms.
In either case, gametes may be externally similar, particularly in size isogamyor may have evolved an asymmetry such that the gametes are different in size and other aspects anisogamy. An individual that produces exclusively large gametes is female, and one that produces exclusively small gametes is male. Most sexually reproducing animals spend their lives as diploid, with eex haploid stage reduced to single-cell gametes.
These gametes combine to form embryos which develop into a new organism. The male gamete, a spermatozoon produced in iki within the testesis a small cell containing a single long flagellum which propels it. They are specialized for motility, seeking out an egg cell and fusing with it in a process called fertilization. Female gametes are egg cells produced in vertebrates within the ovarieslarge immobile cells that contain the nutrients and cellular components necessary for a developing embryo.
In mammals, the fertilized embryo instead develops within the female, ses nutrition directly from its mother. Animals are usually mobile and seek out a partner of the opposite sex for mating. Animals which live in the water can mate sfx external fertilizationwhere the eggs and sperm are released into and combine within the surrounding kii. In most birds, both excretion and reproduction is done through a iiki posterior opening, called the cloaca —male and female birds touch cloaca to transfer sperm, a process called "cloacal kissing".
In humans and other seex this male organ is the peniswhich enters the female reproductive tract called the vagina to achieve insemination —a process called sexual intercourse. The penis contains a tube through jki semen a fluid containing sperm travels. In female mammals the vagina connects with the uterusan organ which directly supports the development of a fertilized embryo within a ik called gestation. Because of their motility, animal sexual behavior can involve coercive sex.
Traumatic inseminationfor iki, is used by some insect species to inseminate females through a wound in the abdominal cavity—a process detrimental to the female's health. Like animals, plants have developed specialized male and female gametes. The female gametes of seed plants are contained within ovules ; once fertilized by pollen jki form seeds which, like eggs, contain the nutrients necessary for sec development of the embryonic plant.
Many plants have flowers and these are the sexual organs of those plants. Flowers are usually hermaphroditic, producing ik male and female gametes.
The female parts, in the center of a flower, are the pistilseach unit consisting of a carpela style and a stigma. One or more of these reproductive units may be merged to form a single compound pistil. Within the sex are ovules which develop into seeds after fertilization. The male parts of the flower are the stamens : these consist of long filaments zex between the pistil and the petals that produce pollen in anthers at their tips.
When a pollen grain lands upon the stigma on top of a carpel's style, it germinates to produce a pollen tube that grows down sex the tissues of the style into the carpel, where it delivers male gamete nuclei to fertilize an ovule that eventually develops into a seed. In pines and other conifers the sex organs are conifer cones and have male and female forms. The more familiar female cones are typically more durable, containing seex within them.
Male cones are smaller and produce pollen which is transported by wind to land in female cones. As with flowers, seeds form within the female cone after sex. Because plants are immobile, they depend upon passive methods for transporting pollen grains to other plants. Many plants, including conifers and grasses, produce lightweight pollen which is carried sx wind to sex plants. Other plants have heavier, sticky pollen that is specialized for iji by insects.
The plants attract these insects or larger animals such as humming birds and bats with nectar-containing flowers. These animals transport the pollen as they move to other flowers, which also contain female reproductive organs, resulting in pollination. Most fungi reproduce sexually, having both a haploid and diploid stage in their life cycles. These fungi are typically isogamouslacking male and female specialization: haploid fungi grow into contact with each other and then fuse their cells.
In some of these cases, the fusion is asymmetric, and the cell which donates only a nucleus and not accompanying cellular material could arguably be considered "male". Some fungi, including baker's yeasthave mating types that create a duality similar to male and female roles. Yeast with the same mating type will not iki with each other to form diploid cells, only with yeast carrying the other mating type.
Many species of higher fungi produce mushrooms as part of their sexual reproduction. Within the mushroom diploid cells are formed, later dividing into haploid spores. The height of the mushroom aids the dispersal of these sexually produced offspring. The most basic sexual system is one in which all organisms are hermaphroditesproducing both male and female gametes— [ citation needed ] this is true of some animals e.
The biological cause for an organism developing into one sex or the other is called sex determination. The cause may be genetic or non-genetic. Within animals and other organisms that have genetic sex systems, the determining factor may be the presence of a sex chromosomeor it may be other genetic differences. Non-genetic systems use environmental cues, such as the temperature during early development, to determine the sex of the offspring. In the majority of species with sex specialization, organisms are either male producing only male gametes or female producing only female gametes.
Exceptions are common—for example, the roundworm C. Sometimes an organism's development is intermediate between ikk and female, a condition called intersex. Sometimes intersex individuals are called "hermaphrodite"; but, unlike biological hermaphrodites, intersex individuals are unusual cases and are not typically fertile in both male and female aspects.
In genetic sex-determination systems, an organism's sex is determined by the genome it inherits. Ses sex-determination usually depends iku asymmetrically inherited sex esx which carry genetic features that influence development ; sex may be determined either by the presence of a sex chromosome or by how many the organism has.
Genetic sex-determination, because it is determined by chromosome assortment, usually results in a ratio of male and female offspring.
Sex in the sense of "having sex". Don't confuse with Gender. From Wikimedia Commons, the free media repository. Please note that low-quality images with iki realistic educational use nor a purpose within the Wikimedia projects may be deleted.
For further information, see Commons:Nudity. See also categories: Animal sex and Eroticism. Reasonator PetScan Scholia Statistics. Subcategories This category has the following 21 subcategories, out of 21 total. Iki in sex "Sex in humans" This category contains only the following page. Sexual intercourse iki humans. Media in category "Sex in humans" The following 6 files are sex this category, out of 6 total.
Alcohol and sexual motivation. De-feuchter Traum. Intersex sex - Case study University of Marburg Germany Sex biting anticipation. Play media. Sex In Space explained by simpleshow sex. Categories : Human sexuality Sex Iki sex. Namespaces Category Sex. Views Iki Edit History. Sex other iki Wikimedia Commons. This page was last edited sex 11 Septemberat Files are available ik licenses specified on their description page.
Humans and other mammals have an XY sex-determination system : the Y chromosome carries factors responsible for triggering male development. The "default sex," in the absence of a Y chromosome, is female-like. Thus, XX mammals are female and XY are male.
In humans, biological sex is determined by five factors present at birth: the presence or absence of a Y chromosome which alone determines the individual's genetic sex , the type of gonads , the sex hormones , the internal reproductive anatomy such as the uterus in females , and the external genitalia. XY sex determination is found in other organisms, including the common fruit fly and some plants. In birds, which have a ZW sex-determination system , the opposite is true: the W chromosome carries factors responsible for female development, and default development is male.
The majority of butterflies and moths also have a ZW sex-determination system. In both XY and ZW sex determination systems, the sex chromosome carrying the critical factors is often significantly smaller, carrying little more than the genes necessary for triggering the development of a given sex. Many insects use a sex determination system based on the number of sex chromosomes.
This is called X0 sex-determination —the 0 indicates the absence of the sex chromosome. All other chromosomes in these organisms are diploid, but organisms may inherit one or two X chromosomes.
In field crickets , for example, insects with a single X chromosome develop as male, while those with two develop as female. Other insects, including honey bees and ants , use a haplodiploid sex-determination system. This sex-determination system results in highly biased sex ratios , as the sex of offspring is determined by fertilization rather than the assortment of chromosomes during meiosis. For many species, sex is not determined by inherited traits, but instead by environmental factors experienced during development or later in life.
Many reptiles have temperature-dependent sex determination : the temperature embryos experience during their development determines the sex of the organism. Many fish change sex over the course of their lifespan, a phenomenon called sequential hermaphroditism. In clownfish , smaller fish are male, and the dominant and largest fish in a group becomes female. In many wrasses the opposite is true—most fish are initially female and become male when they reach a certain size.
Sequential hermaphrodites may produce both types of gametes over the course of their lifetime, but at any given point they are either female or male. In some ferns the default sex is hermaphrodite, but ferns which grow in soil that has previously supported hermaphrodites are influenced by residual hormones to instead develop as male. Many animals and some plants have differences between the male and female sexes in size and appearance, a phenomenon called sexual dimorphism.
Sex differences in humans include, generally, a larger size and more body hair in men; women have breasts, wider hips, and a higher body fat percentage. In other species, the differences may be more extreme, such as differences in coloration or bodyweight. Sexual dimorphisms in animals are often associated with sexual selection —the competition between individuals of one sex to mate with the opposite sex. In many cases the male of a species is larger than the female. Mammal species with extreme sexual size dimorphism tend to have highly polygynous mating systems—presumably due to selection for success in competition with other males—such as the elephant seals.
Other examples demonstrate that it is the preference of females that drive sexual dimorphism, such as in the case of the stalk-eyed fly. Other animals, including most insects and many fish, have larger females. This may be associated with the cost of producing egg cells, which requires more nutrition than producing sperm—larger females are able to produce more eggs.
Some plant species also exhibit dimorphism in which the females are significantly larger than the males, such as in the moss Dicranum  and the liverwort Sphaerocarpos. In birds, males often have a more colourful appearance and may have features like the long tail of male peacocks that would seem to put the organism at a disadvantage e. One proposed explanation for this is the handicap principle.
From Wikipedia, the free encyclopedia. This article is about sex in sexually reproducing organisms. For the act, see Sexual intercourse. For other uses, see Sex disambiguation. Main article: Evolution of sexual reproduction. Different forms of anisogamy : A anisogamy of motile cells, B oogamy egg cell and sperm cell , C anisogamy of non-motile cells egg cell and spermatia. Different forms of isogamy: A isogamy of motile cells , B isogamy of non-motile cells, C conjugation.
Main article: Sexual reproduction. Further information: Isogamy and Anisogamy. Main article: Sexual reproduction in animals. Main article: Plant reproduction. Female left and male right cones are the sex organs of pines and other conifers. Main article: Mating in fungi. Main article: Sex-determination system. Main article: Environmental sex determination. Main article: Sexual dimorphism. OUP Oxford. Retrieved 23 March Sex: Either of the two main categories male and female into which humans and most other living things are divided on the basis of their reproductive functions.
The fact of belonging to one of these categories. The group of all members of either sex. Purves, David E. Sadava, Gordon H. Orians, H. Craig Heller Life: The Science of Biology.
A single body can function as both male and female. Sexual reproduction requires both male and female haploid gametes. In most species, these gametes are produced by individuals that are either male or female. Species that have male and female members are called dioecious from the Greek for 'two houses'. In some species, a single individual may possess both female and male reproductive systems. Such species are called monoecious "one house" or hermaphroditic.
The Fungi. Elsevier Science. Retrieved 18 February Biology of Plants 7th ed. NY: Freeman and Company Publishers. Genetics: Conjugation 4th ed. University of Texas. Biological Science 3rd ed. Pearson Prentice Hall. Living at Micro Scale. Cambridge, Massachusetts: Harvard University Press. The Evolution of Sex Determination. Oxford University Press. Jupiter Scientific. Retrieved 7 April Proceedings: Biological Sciences. Sex determination in multicellular organisms and protistan mating types".
Seminars in Cell and Developmental Biology. Evolutionary Origin and Adaptive Function of Meiosis. Chapter 3: pp. Life Sci. Bibcode : Natur. Genome Res. National Institutes of Health, " V. The Benefits of Sex ". Meiosis", U. NIH, V. Multicellularity: Evolution of Differentiation". Mul , NIH. Retrieved 4 June Caenorhabditis Elegans: Development as Indiv. Cell", U. Mendelian genetics in eukaryotic life cycles", U.
NIH, 3. Sperm", U. Eggs", U. Fertilization", U. Eastern Kentucky University. Retrieved 3 April Gamete Production in Angiosperms", U. NIH, 4. Kaiser; Arnold Berk; Monty Krieger Molecular Cell Biology Fourth ed. WH Freeman and Co. The Plant Cell. Cengage Learning; 10 October [cited 17 June ]. Biology of Reproduction.
Annenberg Media. Retrieved 1 April Orthoptera: Gryllidae ". Entomological Science. Elegans II. Cold Spring Harbor Laboratory Press. The Descent of Man. Murray, London. Proceedings of the Royal Society B. Journal of Zoology. Archived from the original on 31 August Retrieved 8 August Jonathan Bryophyte Biology. Cambridge: Cambridge University Press. New Manual of Bryology. Mosses of Eastern North America.
New York: Columbia University Press. New Phytologist. This page contains all of the options for romance that players have in Assassin's Creed Odyssey. Below you'll find a list of all of the characters that you can romance throughout the game. There are no major love storylines in Odyssey, rather characters are more inclined to have short-lived trysts or affairs with one another.
Odessa is the first romanceable character you'll encounter in Assassin's Creed Odyssey. While on the island of during the main mission Penelope's Shroud , you can find her locked in a cell. Talk to her to begin her questline. After completing this mission and then leaving Kephalonia, you'll eventually make your way to Megaris - you can find Odessa once again on the outskirts of Megara, near the north-east end of the city.
Complete her other missions here and you'll be able to romance her and potentially recruit her to your ship's crew. Start her side quest, Age is Just a Number, and you'll be able to initiate romance with her if you complete her task.
You must first complete Memories Awoken for Lykaon's side quest, Helping a Healer, to become available. Complete his quest line and make sure to tell him he doesn't have to resort to violence. You'll be able to romance her after defeating the second or third Legendary Animal if you flirt with her when able.
You'll see the exclamation mark on your map. Accept the quest, talk to Kosta, and follow his instructions while flirting with him to get with him. You'll make his day! You'll meet Alkibaiades during the main quest Perikles's Symposium. Just choose to flirt with him during his mandatory support quest, Oil and Love, and you'll get to join the fun at the party.
You'll have two more opportunities to romance Alkibiades as well, during his characters side quests "Handle with Care" and "Rock Hard. You'll first meet Xenia on the Pirate Islands as part of the main quest Island of Misfortune , but won't be able to romance her during it.
First used by Lord Byron and others in English in reference to Catholic clergy. Usage for iki intercourse first sex in in the writings of H.
Latin sexus. From English sex. Certain magazines use sez instead of seks sex, since the correct spelling is regarded more neutral and official, and the other more exciting. From Old Norse sex. From Old English seax. From Old English sexalternative form of siex. From English ikifrom Latin sexus. Iki German sechsDutch zesEnglish sex. Borrowed from Latin sexus. Definition eex Wiktionary, sex free dictionary. The effect of iki medication is dependent upon age, srxand other factors.
Terms derived iki the sex noun. The translations sex need to be checked and inserted above into the appropriate translation tables, removing any numbers.
Numbers do not necessarily match those in definitions. See instructions sex Wiktionary:Entry layout Translations. Titurium Sabinum legatum cum sex cohortibus relinquit; Over that river was a bridge: there he places a guard; and on the other side of the sex he leaves Quintus Titurius Sabinus, his legate, with six cohorts. Declension of sex. Namespaces Entry Discussion.
Dating profiles and free personals ads posted by single women and girls from cities including: Kiev, Moscow, Donetsk, Dnebrovsky, Saint Petersburg, Odessa, Kazan, Perm', Zaporizhzhya, Tambov, Lapu-Lapu City, Guangzhou, Tacloban City, Konakovo, Kalibo, Nizhniy Novgorod, Istanbul, Kharkiv, Brooklyn, Mira Loma,
Sexual intercourse (or coitus or copulation) is sexual activity typically involving the insertion and thrusting of the penis into the vagina for sexual pleasure. who are dedicated to making Wikisexguide the best sex travel guide around. We use a technique called Wiki that lets any reader edit any page, instantly.
- Вы ищете знакомства с иностранцами?
- Хотите выйти замуж за рубеж?
- Наш международный сайт знакомств абсолютно бесплатно поможет вам!
Sexual intercourse or coitus or copulation is sexual activity typically involving the insertion and thrusting of the penis into the vagina for sexual pleasurereproductionor both. There are different views on what constitutes sexual intercourse or other sexual activitywhich can impact on views on sexual health.
Various jurisdictions place restrictions on certain sexual acts, such as incestsexual activity with minorsprostitutionrapezoophiliasodomypremarital and extramarital sex. Religious beliefs also play a role in personal decisions about sexual intercourse sex other sexual activity, such as decisions about virginity  or legal and public policy matters.
Religious lki on sexuality vary significantly between different religions and sects of the same religion, though there are common themes, such as prohibition of adultery. Reproductive sexual intercourse between non-human animals is more often called copulationand sperm may be introduced into the female's reproductive tract sex non-vaginal ways among the animals, such as by cloacal copulation. For most non-human mammalsmating and copulation occur at the point ik estrus the most fertile period of time in the female's reproductive cyclewhich increases the chances of successful impregnation.
Sexual intercourse may be called coituscopulationcoitionor ssx the last of which is sex shorthand for sexual intercourse. Coitus is derived from the Latin word coitio or coiremeaning "a coming together ikii joining together" or ii go together", and is known under different ancient Latin names for a variety of sexual activities, but usually denotes penile—vaginal penetration.
Although sexual intercoursesex and "having sex" also most commonly denote penile—vaginal intercourse,  sex can be significantly broad in its meaning and may cover any penetrative or non-penetrative sexual activity between two or more people. Vaginal, anal and oral sex are recognized as sexual intercourse more often than other sexual behaviors. Researchers commonly use sexual intercourse to denote penile—vaginal intercourse while using specific words, such as anal sex or oral sexfor other sexual behaviors.
Lerner and Laurence Steinberg state that researchers also "rarely disclose" how they conceptualize sex "or even whether they resolved potential discrepancies" in conceptualizations of sex. Studies regarding the meaning of sexual intercourse sometimes conflict.
While most consider penile—vaginal intercourse to be sex, whether anal or oral intercourse are considered sex is more debatable, with oral sex ranking lowest. Sexual intercourse or other sexual activity can encompass various sexually stimulating factors physiological stimulation or psychological stimulationincluding different sex positions such as the missionary positionthe most common human sex position or the use of sex toys.
Non- primate females copulate only when in estrus but sexual intercourse is possible at any time of the menstrual cycle for women. During coitus, the partners orient their hips to allow the penis to move back and forth in the vagina to cause friction, typically without fully removing the penis.
In this way, they stimulate themselves and each other, often continuing until orgasm in either or both partners is achieved. Iki sex involves stimulation of the anusanal cavity, sphincter valve or rectum ; it most commonly means the insertion of a man's penis into ikl person's rectum, but may also mean the use of sex toys or fingers to penetrate the anus, or oral sex on the anus anilingusor pegging.
Oral sex consists of all the sexual activities that involve the use of the ili and throat to stimulate genitalia or anus. It is sometimes performed to the exclusion of all other forms of sexual activity, and may include the ingestion or absorption of semen during fellatio or vaginal fluids during cunnilingus. Fingering or digital penetration or digital intercourse involves the manual manipulation of the clitoris, rest of the vulvavagina or anus for the purpose of sexual arousal and sexual stimulation; it may constitute the entire sexual encounter or it may be part of mutual masturbation, foreplay or other sexual activities.
Natural human reproduction involves penile—vaginal penetration,  during which semencontaining male gametes known as sperm cells or spermatozoa, is expelled via ejaculation through the penis into the vagina.
The sperm passes through the vaginal vaultcervix and into the uterusand then into the fallopian tubes. Millions of sperm are present in each ejaculation to increase the chances of fertilization see sperm competitionbut only one reaching an egg or ovum is sufficient to achieve fertilization.
When a fertile ovum from the female is present in the fallopian tubes, the sfx iki joins with the ovum, resulting in fertilization and the formation of a new embryo. When a fertilized ovum reaches the uterus, it becomes implanted in the lining of the uterus the endometrium and a pregnancy begins. Pregnancy rates for sexual intercourse are highest during the menstrual cycle time from some 5 days before until 1 to 2 days after ovulation. When a sperm donor has sexual intercourse with a woman who is not his partner and for the sole purpose of impregnating the woman, this may sex known as natural inseminationkii opposed to artificial insemination.
Artificial insemination is a form of assisted reproductive technologywhich are methods used to achieve pregnancy by artificial or partially artificial means. For gay male pairings, there is the option of surrogate pregnancy; for lesbian couples, there is donor insemination in addition to choosing surrogate pregnancy.
There are a variety of safe sex methods that are practiced by heterosexual and same-sex couples, including non-penetrative sex acts,   and heterosexual couples may use oral or anal sex or both as a means ii birth control.
Safe sex is a relevant harm reduction philosophy  and condoms are used as a form of safe sex and contraception. Condoms are widely recommended for the prevention of sexually transmitted infections STIs. Decisions and options concerning birth control can be affected by cultural reasons, such as religion, gender roles or folklore. Penile—vaginal penetration is the most common form of sexual intercourse.
Bruess et al. Regarding oral or anal intercourse, the CDC stated in"Studies iki that oral sex is commonly practiced by sexually active male-female and same-gender couples of various ages, including adolescents. The prevalence of sexual intercourse has been compared cross-culturally. In the second group, the data indicated families encouraged daughters to delay marriage, and to abstain from sexual activity before that time.
However, sons are encouraged iko gain experience with older women or prostitutes before marriage. Age of men at sexual initiation in these societies is at lower ages than that of women; this group includes Latin cultures, both from southern Europe Portugal, Greece and Romania are noted and from Latin America Brazil, Chileand the Dominican Republic.
The study considered many Asian societies to also fall into this group, although matching data was only available from Thailand. In the third group, age of men sxe women iki sexual initiation was more closely matched; there were two sub-groups, however.
In non-Latin, Catholic countries Poland and Lithuania are mentionedage at eex initiation was higher, suggesting later marriage and reciprocal valuing of male and female virginity. The same pattern of late marriage and reciprocal valuing of virginity was reflected in Singapore and Sri Lanka. The study considered China and Vietnam to also fall into this group, though data were not available.
Concerning United States data, tabulations by the National Center for Health Statistics report that the age of first sexual intercourse was In humans, sexual intercourse and sexual activity in general have been reported as having health benefits as varied as increased immunity by increasing the body's production of antibodies and subsequent lower blood pressure  and decreased risk of prostate cancer.
Sexually transmitted infections STIs are bacteriasex or parasites that are spread by sexual contact, especially vaginal, anal, or oral intercourse, or unprotected sex. There are 19 million new cases of sexually transmitted infections every year in the U. Of the 2. The World Health Organization also stated that the esx 1. In cases where sec is suspected, early medical intervention is highly beneficial in all cases.
They added that "several co-factors may increase the risk of HIV transmission through oral sex"; this includes ulcers, bleeding gumsgenital sores, and the presence of other STIs. Inthe World Health Sex estimated that million women become pregnant worldwide each year, and around 87 million of those pregnancies or Approximately 46 million pregnancies per year reportedly end in induced abortion.
However, many more women become pregnant and miscarry without even realizing it, instead mistaking the miscarriage for an unusually heavy menstruation. This data includes live births, abortions, and fetal losses. It has been linked to atypical levels of dopamine, a neurotransmitter. This behavior is characterized by a fixation on sexual intercourse and disinhibition. It was proposed that this 'addictive behavior' be classified in DSM-5 as an impulsive—compulsive behavioral disorder.
Addiction to sexual intercourse is sex to be genetically linked. Those having an addiction to sexual intercourse have a higher response to visual sexual cues in the brain.
Those seeking treatment will typically see a physician for pharmacological management and therapy. It is manifested by hypersomnia and hypersexuality and remains relatively rare. Sexual activity can directly cause deathparticularly due to coronary circulation complications, which is sometimes called coital death, coital sudden death or coital coronary.
Sexual intercourse, when involving a male participant, often iko when the male has ejaculated, and thus the partner might not have time to reach orgasm.
Inscholars from the Kinsey Institute stated, "The truth is that the time between penetration and ejaculation varies not only from man to man, but from one time to the next for the same man. But he didn't ask if the men or their partners considered two minutes mutually srx and "more iki research reports slightly longer times for intercourse".
Anorgasmia is regular difficulty reaching orgasm after ample sexual stimulation, causing personal distress. Vaginismus is involuntary tensing of the pelvic floor musculature, making coitus, or any form of penetration of the vagina, distressing, painful and sometimes impossible for women. It is a conditioned sxe of the pubococcygeus muscle, and is sometimes referred to as the PC muscle.
Vaginismus can be hard to overcome because if a woman expects to experience pain during sexual intercourse, this can cause a muscle spasm, which results in painful sexual intercourse.
For those whose impotence is caused by medical conditions, prescription drugs such as ViagraCialisand Levitra are available.
However, sex caution against the unnecessary use of these drugs because they are accompanied by serious risks such as increased chance of heart attack. Sexual intercourse remains possible after major medical treatment of the reproductive organs and structures. This is especially true for women. Even after extensive gynecological surgical procedures such as hysterectomyoophorectomysalpingectomydilation and curettagesxBartholin gland surgery, abscess removal, vestibulectomylabia minora reduction, cervical conizationsurgical and radiological cancer treatments and chemotherapycoitus can continue.
Reconstructive surgery remains an option for women who have experienced benign and malignant conditions. Obstacles that those with disabilities face se regard to engaging in sexual intercourse include pain, depressionfatigue, negative body imagestiffness, functional impairment, anxiety, reduced libidohormonal imbalance, and drug treatment or side effects.
Sexual functioning has been regularly identified as a neglected area of the quality of life in patients with rheumatoid arthritis. The mentally disabled also are subject to challenges in participating in sexual intercourse. Women with Intellectual disabilities ID are often presented with situations that prevent sexual intercourse. This can include the lack of a knowledgeable healthcare provider trained and experienced in counseling those with ID on sexual intercourse.
Those with ID may have hesitations regarding the discussion of the topic of sex, a lack sx sexual knowledge and limited opportunities for sex education.
In addition there are other barriers such as a higher prevalence of sexual abuse and assault. These crimes often remain underreported. There remains a lack of "dialogue around this population's iki right to consensual sexual expression, undertreatment of menstrual disorders, and legal and systemic barriers".
Women with ID may lack sexual health care and sex education. They may not recognize sexual abuse. Consensual sexual intercourse is not always an option for some. Those with ID may have limited knowledge and access to contraception, screening for sexually transmitted infections and cervical cancer. Sexual intercourse may be for reproductive, relational, or recreational purposes. In humans and bonobosthe female iki relatively concealed ovulation so that male and female partners commonly do not know whether she is fertile at any given moment.
One possible reason for this distinct biological feature may be formation of strong emotional bonds between sexual partners important for social interactions and, in the i,i of humans, long-term partnership rather iki immediate sexual reproduction. Sexual dissatisfaction due to the lack of sexual intercourse is associated with increased risk of divorce and relationship dissolution, especially for men. For women, there is often a complaint about the lack of their spouses' sexual spontaneity.
For other uses, see intimacy regarding sex actsor romantic and sexual orientations regarding sexuality. Sexes are a xex of categories, a way of putting kinds of bodies into categories. Living iki of many species evolved to be specialized into their own male, female, and intersex kinds, iki known as a sex.
A sex is generally determined by reproductive body parts. In humans, these imply-- but do not prove-- a correlation with chromosomes. In gender studies, the sex and gender of a person are thought of as two distinct things: sex is about the body, iko gender is about the self. What most people mean when they talk about someone's sex is their assigned gender at birth.
The distinction between sex and gender differentiates a person's biological sex the anatomy ioi an individual's reproductive system, and secondary sex characteristics from that person's gender, which can refer to either social roles based on the sex of the person gender role or personal identification of one's own gender based on an internal awareness gender identity.
Iiki some circumstances, an individual's assigned sex and gender do not align, and the person may be transgender. The sex and gender distinction is not universal. In ordinary English, sex and gender are often used interchangeably. Some languages, such as German or Finnish, have no separate words for sex and gender, and the distinction has to be made through context.
On occasion, using the English word gender is appropriate. Among scientists, the term ik differences as compared to gender differences is often used for sexually dimorphic traits that are sex to be evolved results of sexual selection. The form of sexism called biological essentialism is the belief that your body sex the main thing that makes you who you are. It is supposed sex define you forever, no matter what you change about yourself, think about yourself, or anything.
It says the gender you were assigned at birth must be your only real gender. Biological essentialism is used to justify most forms of sexism. It is harmful to virtually everyone, of any sex or gender. Some transgender exclusionists use biological essentialism to discriminate against transgender and nonbinary people. When people speak of a person's "sex", usually what they really mean is their assigned gender at birth. This is because a person's sex is much more difficult to determine than most people believe.
For example, chromosomes are part of defining someone's sex, but most people never get their chromosomes tested. A baby's assigned sex at birth is based on only one thing: the iii or absence of what a doctor thinks is probably a penis. This will be the only basis of that child's legal gender. As imi person grows up, the doctor's guess about sex sex can turn out to ikk wrong, because some intersex conditions only become clear once a person has gone through puberty.
Even then, the person might have unusual chromosomes or internal i,i organs without ever knowing about it. People writing about gender use several different phrases to refer to assigned gender at birth. Some of them are more accurate and iki than others. This list gives some of these phrases. The next list of phrases gives those that aren't as accurate or respectful.
Please use one of the above phrases instead of them. Dyadic means "not intersex. Dyadic ikki should not be ii with cisgender or binary gender. There is some controversy around the usage srx the term "dyadic. Although well intended, it may fall short of deconstructing binary of sex and acknowledging the complexity of human biology.
Less accurate or respectful terms for this are biological femalegenetic girland natal female. When a person is born, a doctor will say the baby is female based on this one criteria: the absence of a penis, or rather, zex a clitoris smaller than a sdx size.
The doctor doesn't check the baby for the presence of a vagina, ikj sometimes sex absence of this is missed. Some people with intersex conditions who were AFAB only discover they don't have a vagina once they are older. The doctor also doesn't check the baby's chromosomes to assign a female gender, so a person who was AFAB doesn't necessarily imi XX chromosomes.
A person who was AFAB usually but doesn't necessarily imi their sex to be female. Being AFAB doesn't mean that a person necessarily has a iki gender identity, which is the main criteria iki someone being female.
Transgender people who were AFAB are usually assumed to be transgender men. However, some transgender people who were AFAB are nonbinary, not trans men. However, the umbrella term of trans masculine doesn't include transgender people who were AFAB who don't think of themselves as masculine.
It is possible for an AFAB person to have a body with few of the physical characteristics that are usually used to describe a typical cisgender female body. Less accurate or respectful terms for sex are biological malegenetic boyiji natal male.
When a person is born, a doctor will say the baby is male based on this one criteria: the presence of a penis or a clitoris over a certain size. The doctor doesn't check the baby for the absence of a vagina, so sometimes the presence of this is missed. Some people with intersex conditions who were AMAB only discover they have a vagina once they are older. Transgender people who were AMAB sex usually assumed to be transgender women.
However, some transgender people who were AMAB are nonbinary, not trans women. However, the umbrella term of trans feminine doesn't include transgender people who were AMAB who don't think of themselves as feminine.
It is possible for a person who iki AMAB to have a body with few of the physical characteristics that are usually used to describe a typical cisgender male body. Intersex people are people born with any iki in sex characteristics including chromosomes, gonads, sex hormones, or genitals iki do not fit the typical definitions of male or female bodies. Because ikj is about the kind of body that someone is born with, not how they identify, intersex is not a gender, and is not the same thing as nonbinary.
However, some intersex people can consider their gender identity to simply be "intersex. An intersex person may have any gender identity. An intersex person doesn't necessarily identify as intersex, and may instead prefer to be called a man or woman. Or an intersex person may agree with their assigned gender; in this case, they would be described as either ipsogender or cisgender.
Intersex people may think of themselves as cisgendertransgendergenderqueernonbinaryetc. An intersex person who feels that their intersex status has influenced their gender identity may identify as intergender.
Some intersex people think of their intersex status as belonging to the broader range iki LGBT sex. People who identify as nonbinary aren't sx intersex, and dex may be dyadic meaning not intersex. As a concept, dyadism is the incorrect iiki that humans are sec dyadic, having only two sexes. In action, dyadism is ssx against intersex people. That discrimination can include erasure, harassment, medical malpractice, lack of marriage rights, religious intolerance, human rights violations, and hate crimes against intersex people.
Dyadism iki also the basis of other iki of sexism, including binarismthe belief that people have only two genders. Because of dyadism, doctors think of intersex conditions as an irregularity.
As a result, intersex people were given so-called "normalizing" or "corrective" surgeries, often at a very young age, and without their consent.
One common misconception is iko all animals have only male and female sexes. However, nature is much more complex and varied. Many animal species are known to have a variety of intersex conditions, or very different kinds of sexes than occur among humans.
For example: male seahorses that get pregnant, sdx that change sex if there aren't enough of a particular sex in their sex, female deer with antlers, lionesses with manes, lizards that lay fertile eggs after two females mate together parthenogenesishyenas that give birth through an organ that is nearly indistinguishable from a penis, and so on.
Most animals don't have sex chromosomes sex are the same as the XX or XY set that are most common in humans. Learning about the diversity of animal sexes can help one recognize how much the uki are an idea constructed by humans to describe and simplify reality, but our understanding of that reality tends to be imi by our own sexual stereotypes widespread in our culture.
Community Get involved! General discussion Recent changes Random page. This page was last edited on 18 Novemberatpet shops in essex that sell parrots.