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Intercourse
Vaginal sexual intercourse is also called coitus. The purpose of vaginal intercourse is reproduction. Although reproduction is the purpose, intercourse is often performed exclusively for pleasure and as a way to express love and intimacy.
Intercourse may be preceded by foreplay, which leads to the sexual arousal of both partners, resulting in the an erection of the penis and natural lubrication of the vagina.
To engage in intercourse, the erect penis is inserted into the vagina and one or both of the partners move their hips to move the penis backward and forward inside 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. Penetration by the hardened erect penis is also known as intromission.
Intercourse is the basic reproductive method of humans. During ejaculation, which usually accompanies male orgasm, a series of muscular contractions delivers semen from the penis into the vagina.
The route of the sperm from the vault of the vagina is through the cervix and into the uterus, and then into the fallopian tubes. Millions of sperm are present in each ejaculation, to increase the chances of one fertilizing an egg. When a fertile egg from the female is present in the fallopian tubes, the male sperm joins with the egg resulting in fertilization and the formation of a new embryo. When a fertilized egg reaches the uterus, it becomes implanted in the lining of the uterus and a pregnancy has begun.
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