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Sexual intercourse or coitus or copulation is principally the insertion and thrusting of the penisusually when erectinto the vagina for sexual pleasurereproductionor both. There are different views on what constitutes sexual intercourse or other sexual activity[9] [10] which can impact on views on sexual health.

Various jurisdictions have placed restrictive laws against certain sexual acts, such as incestsexual activity with minorsprostitutionrapezoophiliasodomypremarital and extramarital sex.

Religious beliefs also play a role in personal decisions about sexual intercourse or other sexual activity, such as decisions about virginity[10] [20] or legal and public policy matters.

Religious views 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 How to do sex how to do sex non-vaginal ways among the animals, such as by cloacal copulation. For most non-human mammalsmating and copulation occur at the point of 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 intercourse the last of which is typically shorthand for sexual intercourse.

Coitus is derived from the Latin word coitio or coiremeaning "a coming together or joining together" or "to go together", and is known under different ancient Latin names for a variety of sexual activities, but usually denotes penile—vaginal penetration.

Although sexual intercourse and sex also most commonly denote penile—vaginal intercourse, [33] sex and the phrase "have sex" can be significantly broad in their How to do sex how to do sex 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.

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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 or not anal or oral intercourse is considered sex is more debatable, with oral sex ranking lowest.

Copulation ranges from a purely reproductive activity to one of emotional bonding. For example, sexual intercourse and sexual activity in general often play a strong role in human bonding. In humans and bonobosthe female undergoes 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 case of humans, long-term partnership rather than immediate sexual reproduction. The resulting cooperation encourages collective tasks that promote the survival of each member of the group.

Sexual intercourse or other sexual activity can encompass various sexually stimulating factors physiological stimulation or psychological stimulationincluding different sex positions or the use of sex toys. In most mammals, the anatomy of the reproductive organs and some circuits of the nervous system are specifically organized for heterosexual copulation.

Copulation corresponds to a succession of innate sexual reflexes: These copulatory reflexes are controlled by hormones and facilitated by sexual pheromones. Non-primate females copulate only when in estrus[63] 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 How to do sex how to do sex.

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Anal sex involves stimulation of the anusanal cavity, sphincter valve or How to do sex how to do sex ; it most commonly means the insertion of a man's penis into another 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 mouth 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.

Sexual intercourse is perhaps million years old, and it is likely that the oldest jawed fish on Earth was the first animal to reproduce by copulation. The subsequent route of the sperm from the vault of the vagina is through the cervix and into the uterusand then into the fallopian tubes.

Millions of sperm are present in each ejaculation, to increase the chances of one fertilizing an egg or ovum see sperm competition. 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. When a fertilized ovum reaches the uterus, it becomes implanted in the lining of the uterus the endometrium and a pregnancy begins.

Pregnancy How to do sex how to do sex 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 be known as natural inseminationas 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.

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