Inserting somethingup the ass that increases pleasure, like a didlo, or a string of beads.
Can be done by both male AND female. Males are not gay if they masturbate anully.
If someone has been inside someones ass for ages, meaning they have been sucking up to them and trying to be as helpfull as possible to them, then they start to stop i.e starting to climb out of their ass, the light coming from outside into the arse shining into the persons eyes, like coming out of a dark tunnel and seeing light pop through, is described as anul sunshine. Its complex I know but its cool.