Sexual intercourse
Sexual intercourse, also known as copulation or coitus, commonly refers to the act in which the male reproductive organ enters the female reproductive tract.[1][2] The two entities may be of opposite sexes or not, or they may be hermaphroditic, as is the case with snails. In recent years, penetration of non-sexual organs (oral intercourse, anal intercourse) or by non-sexual organs (fingering, fisting)[2] are also included in this definition. Traditionally, intercourse has been viewed as the natural endpoint of all sexual contact between a man and a woman.[2] Non-penetrative sexual contacts and mutual masturbation are usually referred to as outercourse (oral sex may or not be penetrative),[3][4][5][6] whereas the term sex, in the context of sexual intimacy, is often understood more widely to include any mutual genital stimulation.
