Doggy style

Doggy style is any sex position in which a person bends over, crouches on all fours (usually on hands and knees), or lies on his or her abdomen, for sexual intercourse. During vaginal penetration from behind, the penis may penetrate deeper into the vagina, reaching preferential contact with the posterior wall of the vagina and probably reaching the posterior fornix. The active partner may also massage or stimulate the receiving partner's erogenous zones.