Positions for anilingus, also known as "butt licking," "rimming", "anal-oral sex", "rimjob", or "tossing the salad", "analgasm" are often variants on those for genital-oral sex. Rimming-specific positions include:
The passive partner is on all fours. The active partner is behind them.
The passive partner is on their back with their legs up.
The Rusty trombone, in which a male is standing while the active partner is both performing anilingus from behind, generally from a kneeling position, while also masturbating the standing partner, thus somewhat resembling someone playing the trombone.
"Man, you wouldn't believe just how much Hannah's girlfriend loves analigus!! Hannah says she's a total freak!"
"Andrew's new chick loves playing 'the Rusty trombone' for him, whenever she get the chance!"