coitus
n. an act of sexual union, usually the insertion of the penis into the vagina followed by ejaculation. Variations include, among others, coitus a tergo, in which the penis is inserted from the rear, and coitus inter femora (interfemoral sex), in which the penis is inserted between the pressed thighs of the partner. Also called coition; intercourse; sexual intercourse. See also anal intercourse; carezza; copulation. —coital
adj.