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The stimulation triggers rhythmic, involuntary contractions in smooth muscle in the male reproductive tract, especially the vas deferens and the prostate.

The contractions rapidly force sperm out of each epididymis. They also force the contents of seminal vesicles and the prostate gland into the urethra.

The resulting mixture, semen, is ejaculated into the vagina. Janell L. Carroll Sexuality Now: Embracing Diversity. Vaginal intercourse also referred to as sexual intercourse involves inserting the penis into the vagina.

Essential Concepts for Healthy Living. Most heterosexuals are familiar with the notion of 'having sex' or sexual intercourse as vaginal sex, the insertion of a penis into a vagina.

Vaginal sex, or coitus, is the most common and popular form of intimate sexual activity between partners. Archived from the original on August 22, Retrieved January 12, Human Sexuality in a World of Diversity.

Discovering Biological Psychology. World Health Organization. January Retrieved September 5, In English, the term 'sex' is often used to mean 'sexual activity' and can cover a range of behaviours.

Other languages and cultures use different terms, with slightly different meanings. Nancy W. Denney; David Quadagno Human Sexuality.

Mosby-Year Book. Although the term intercourse is usually used to refer to the insertion of the penis into the vagina, it is also used to refer to oral intercourse or anal intercourse in which the penis is inserted into the mouth or the anus, respectively.

Dianne Hales Brief Edition 3rd ed. The Encyclopedia of Mental Health. Infobase Publishing. An Invitation to Health Brief — Sexually Transmitted Infections.

Elsevier Health Sciences. Carpenter LM NYU Press. Retrieved October 8, Most people agree that we maintain virginity as long as we refrain from sexual vaginal intercourse.

But occasionally we hear people speak of 'technical virginity' [ Advanced biology. Oxford University Press.

Retrieved October 21, Pearson Education India. Petri, John M. Govern Motivation: Theory, Research, and Application. Trends Ecol. Palgrave Macmillan.

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Retrieved September 6, Retrieved August 23, Retrieved August 24, The widespread, unquestioned equation of penile—vaginal intercourse with sex reflects a failure to examine systematically 'whether the respondent's understanding of the question matches what the researcher had in mind.

Laura M. Carpenter In many cultures around the world, vaginal sex is what is usually implied when people refer to 'having sex' or 'sexual intercourse'.

It is the most frequently studied behavior and is often the focus of sexuality education programming for youth. Retrieved March 30, Retrieved December 26, Concise Medical Dictionary.

Retrieved July 4, Journal of Pediatric and Adolescent Gynecology. Harvey B. Milkman; Kenneth W. Wanberg Retrieved October 9, Cohen But occasionally we hear people speak of 'technical virginity' Data indicate that 'a very significant proportion of teens ha[ve] had experience with oral sex, even if they haven't had sexual intercourse, and may think of themselves as virgins'.

Robert Crooks; Karla Baur Our Sexuality. Noncoital forms of sexual intimacy, which have been called outercourse, can be a viable form of birth control.

Outercourse includes all avenues of sexual intimacy other than penile—vaginal intercourse, including kissing, touching, mutual masturbation, and oral and anal sex.

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McAnulty; M. Michele Burnette Andrew Baum; Tracey A. Revenson; Jerome Singer Handbook of Health Psychology 2nd ed. Psychology Press.

Having started with a discussion of penile-vaginal intercourse as the act that designates sexual initiation, as defined in most studies, we would like to undercut that position by stressing the need to define sex more broadly.

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In the human male, the penis serves both excretory and reproductive functions. During intercourse, the blood flow is temporarily increased and trapped in the penis so that it becomes enlarged and elevated, a condition known as erection.

Erection changes the normally soft and flaccid organ to one of greater size and rigidity to permit easier penetration into the reproductive tract of the female.

In the female reproductive system, an external opening leads to the vagina , which in turn communicates with the uterus or womb , a thick-walled pear-shaped organ where the sperm fertilizes the egg and where the fetus develops.

In human beings, a pattern of physiological events occurs during sexual arousal and intercourse. These events may be identified as occurring in a sequence of four stages: excitement, plateau, orgasm, and resolution.

The basic pattern is similar in both sexes, regardless of the specific sexual stimulus. In the excitement stage , the body prepares for sexual activity by tensing muscles and increasing heart rate.

In the male, blood flows into the penis, causing it to become erect; in the female, the vaginal walls become moist, the inner part of the vagina becomes wider, and the clitoris enlarges.

In the plateau stage , breathing becomes more rapid and the muscles continue to tense. The glans at the head of the penis swells and the testes enlarge in the male.

In the female, the outer vagina contracts and the clitoris retracts. At orgasm the neuromuscular tension built up in the preceding stages is released in a few seconds.

In the woman, the vagina begins a series of regular contractions. In the man, the penis also contracts rhythmically, to expel the sperm and semen ejaculation.

The succeeding resolution stage brings a gradual return to the resting state that may take several hours. In the male, the penis shrinks back to its normal size; in the female, the vagina and other genital structures also return to their pre-excitement condition.

The resolution stage in men contains a refractory period of several minutes to a few hours, during which the man is incapable of further sexual arousal.

Women have no such refractory period and can quickly become aroused again from any point in the resolution stage. In some animals, such as sheep and migratory birds, copulation occurs only seasonally.

During the breeding season, hormones are produced in both the male and female species that prepare their reproductive systems for copulation.

In the nonbreeding seasons, the hormone levels drop so that the animals are not capable of fertilized breeding and do not have the desire to engage in copulation.

Sexual intercourse. Article Media. Info Print Cite.

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