Sexual intercourse

Sex, more formally known as sexual intercourse, coitus, or copulation, is an intimate social activity typically involving the insertion of the erect male penis inside the female vagina and followed by thrusting motions for erotic pleasure, biological reproduction, or both. This specific type of sex is also known as vaginal intercourse. However, other forms of penetrative sexual intercourse also exist, including anal sex, oral sex, fingering and penetration by use of a dildo, and vibrators. The desire for these activities is grounded in natural human instinct and they involve physical intimacy between two or more people, usually enacted by humans solely for physical-emotional pleasure, sometimes contributing to human bonding.

sexual activity involving the stimulation of the genitalia by the use of the mouth

A sex position is a positioning of the bodies that people use to engage in sexual intercourse or other sexual activities. Sexual acts are generally described by the positions the participants adopt in order to perform those acts. Though sexual intercourse generally involves penetration of the body of one person by another, sex positions commonly involve non-penetrative sexual activities.

sexual activity that involves inserting a person's body part into another person

sexual activity typically involving the insertion and thrusting of the penis into the vagina for sexual pleasure, reproduction, or both

Sexual activity in the weightlessness of outer space

reflex in some mammals

Thrusting motion of the pelvic region

tree on Hampstead Heath in London