If you’re going to be the receptive party for anal intercourse or anal stimulation, perhaps the closest thing to the “missionary position” for anal sex would be to get down on your knees, lean over and rest yourself on your elbows, spread your cheeks, and think happy thoughts while somebody on his knees behind you slowly makes his way in. On the other hand, “sitting” on your partner’s pole has the advantage that the receptive party controls the insertion. Make sure to clearly communicate with your partner so that nothing happens too fast and no one gets hurt. Communication, as well as plenty of lube and condoms, is the key to anal sex.