Anal sex (also called anal intercourse) is the sex act in which the penis is inserted into the anus of a sexual partner. The term can also include other sexual acts involving the anus, including fingering and object insertion. While anal sex is commonly associated with male homosexuality, research shows that not all gay males engage in anal sex and that it is not uncommon in heterosexual relationships. Types of anal sex can also be a part of lesbian sexual practices.
Many people find anal sex pleasurable, and some may reach orgasm—through stimulation of the prostate in men, and clitoral and G-Spot leg stimulation in women.