Sexual intercourse wikipedia

Human sexual activityhuman sexual practice or human sexual behaviour is the manner in which humans experience and express their sexuality.

Sexual penetration is the insertion of a body part or other object into a body orifice , such as the mouth , vagina or anus , as part of human sexual activity or sexual behavior in non-human animals. The term is most commonly used in statute law in the context of proscribing certain sexual activities. Terms such as " sexual intercourse " or " carnal knowledge " are more commonly found in older statutes, while many modern criminal statutes use the term "sexual penetration" because it is a broad term encompassing unless otherwise qualified any form of penetrative sexual activity, including digital i. Some jurisdictions refer to some forms of penetration as "acts of indecency ", or other terminology. When a penis is inserted into a vagina, it is generally called vaginal sex , vaginal intercourse, [1] [2] or penis-in-vagina PIV sex. The tongue may also penetrate the anus during anilingus.

Sexual intercourse wikipedia

Penile vaginal intercourse or vaginal intercourse is a form of sexual intercourse in human sexuality , in which an erect penis is inserted in a vagina. It corresponds to mating or copulation in non-human animals. Some of the synonyms are used for other variants of sexual intercourse as well. The desire for sensual pleasure is usually the main motivation for humans, and sometimes the wish to have a baby or more children. During coitus without condom , sperms enter the vagina, first with the pre-ejaculate and then a larger amount through male ejaculation. Sperm swim through the cervix and the uterus into the fallopian tubes of the woman. If they meet a fertilisable egg cell after or during an ovulation , or if an ovulation occurs hours or days later, one sperm can fertilize it. The resulting zygote develops into the early embryonic stages and, in the meantime, migrates from the fallopian tube into the uterus. The nidation of the embryo called blastocyst at this stage of development with the beginning of the production of hCG marks the beginning of a pregnancy. For people who do not want another child, contraception has made it possible to separate vaginal intercourse from its biological function of procreation. Since there is no mating season estrus in humans, the partners can have penile-vaginal intercourse distributed over the menstrual cycle regardless of the time of ovulation, even when the woman is already pregnant and after the menopause. Couples who wish to have offspring can avail themselves of the tests for sexually transmitted infections recommended by the WHO , so that after ruling out or treating any detected infection they can have penile-vaginal intercourse without using a condom. There are currently more than 7. The increasing proportion of people conceived through intrauterine insemination and in vitro fertilisation is still comparatively small.

National Institutes of Health, " V. In the third group, age of men and women at sexual initiation was more closely matched; there were two sub-groups, however.

Sex is the trait that determines whether a sexually reproducing organism produces male or female gametes. By convention, organisms that produce smaller, more mobile gametes spermatozoa , sperm are called male , while organisms that produce produce larger, non-mobile gametes ova , often called egg cells are called female. In non-hermaphroditic species, the sex of an individual is determined through one of several biological sex-determination systems. Most mammalian species have the XY sex-determination system , where the male usually carries an X and a Y chromosome XY , and the female usually carries two X chromosomes XX. Other chromosomal sex-determination systems in animals include the ZW system in birds, and the XO system in insects.

This file contains additional information such as Exif metadata which may have been added by the digital camera, scanner, or software program used to create or digitize it. If the file has been modified from its original state, some details such as the timestamp may not fully reflect those of the original file. The timestamp is only as accurate as the clock in the camera, and it may be completely wrong. From Wikimedia Commons, the free media repository. File information. Structured data. Captions Captions English Sexual intercourse with Insemination. Summary Description Human Intercourse. The video ends with penis ejaculation.

Sexual intercourse wikipedia

Sexual activities involving men who have sex with men MSM , regardless of their sexual orientation or sexual identity , can include anal sex , non-penetrative sex , and oral sex. Evidence shows that sex between men is significantly underreported in surveys. Various sex positions may be performed during sexual activity between men.

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In: International Journal of Fertility and Sterility. To reduce the risk of unintended pregnancies, some people who engage in penile-vaginal sex may use contraception , such as birth control pills , a condom , diaphragms , spermicides , hormonal contraception or sterilization. Cambridge University Press. Wegner Browning: Vaginal length and sexual function after colpopexy for complete uterovaginal eversion. Medical microbiology 7th ed. Main article: Sexology. Sexual relationship phenomena. Elsevier India. Retrieved September 8, In the West, sex before marriage is not illegal. He has a sensitive touch and never hesitates to ask how I like my clitoris touched. When a fertile ovum from the female is present in the fallopian tubes, the male gamete joins with the ovum, resulting in fertilization and the formation of a new embryo.

Sexual arousal also known as sexual excitement describes the physiological and psychological responses in preparation for sexual intercourse or when exposed to sexual stimuli.

October Cranston Bautista et al. Human Reproductive Biology. Despite stereotypes and common misconceptions, there are no forms of sexual acts exclusive to same-sex sexual behavior that cannot also be found in opposite-sex sexual behavior, except those involving the meeting of the genitalia between same-sex partners — tribadism generally vulva -to-vulva rubbing and frot generally penis -to-penis rubbing. The Independent. Journal of Youth and Adolescence. Juni , Vol. Religious Schools V. February 20, Contraception allows people to keep "sex for fun" separate from "sex to make children". Most women report the inability to achieve orgasm with vaginal intercourse and require direct clitoral stimulation See, for example; "Sexual intercourse". Sexual intercourse may be for reproductive, relational, or recreational purposes. Barnhart, Adriana Izquierdo, E.