What is sex?!

What is sex?

intercourse

Vaginal sexual intercourse, also called coitus, is the human form of copulation. While its primary purpose is the reproduction and continued survival of the human species, it is often performed exclusively for pleasure and/or as an expression of love and emotional intimacy. Sexual intercourse typically plays a powerful bonding role; in many societies it is normal for couples to have frequent intercourse while using birth control, sharing pleasure and strengthening their emotional bond through sex even though they are deliberately avoiding pregnancy.

Sexual intercourse is also defined as referring to any form of insertive sexual behavior, including oral sex, as well as anal intercourse. The phrase to have sex can mean any or all of these behaviors, as well as other non-penetrative acts not considered here.

Coitus may be preceded by foreplay, which leads to sexual arousal of the partners, resulting in the erection of the penis and natural lubrication of the vagina.
Coition of a Hemisected Man and Woman (c. 1492, by Leonardo da Vinci) is an artist's interpretation of what happens inside the body during coitus.
Coition of a Hemisected Man and Woman (c. 1492, by Leonardo da Vinci) is an artist's interpretation of what happens inside the body during coitus.

To engage in coitus, 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 highly pleasurable orgasm in either or both partners is achieved. Penetration by the hardened erect penis is also known as intromission, or by the Latin name immissio penis (Latin for "insertion of the penis").