intimate act of fucking some one when you look at the anal area. Typical intimate practice between homosexuals and hetrosexuals. Can be used as a form of contraceptive. Is considered more stimulating than reguular sexual intercourse because the anus present a tighter fit for the penis. In females it provides a sense of becoming more "filled". Could be done is various sexual jobs but most common is the "doggie style" position. Commonly termed: " using it up the ass". when a male is behind his feminine companion, who's typically bent over, and shoves his penis in her vagina and begins to bang the lady. could be extremely painful for her.