Sex where the man inserts his penis into the partner's Anus. Can be used either as Homosexual or Heterosexual. Has bad stigma as gay man only sex, but, several women thouroughly enjoy anal stimulation... as well as most straight men also enjoy (or would enjoy, assuming they had open minds and experemented with their girlfriends/wife's, yes, STRAIGHT).
"I fucked shelly in the ass last night"
"I slammed my cock in her tight ass"
"I love getting a hard cock in my ass"
"I love it when she eats my ass"