DEFINITION: Anal sex is when a finger, a mouth, a penis or a sex toy is used to stimulate the delicate nerve endings in the anus.
SLANG: Common slang terms for anal sex include back-door sex, fudge-packing, anal play, rear entry and doggy-style (but doggy-style can also mean penis-in-vagina intercourse from behind). Rimming is a slang term for oral-anal sex.