Originally Posted by MSD

According to a porn producer/cameraman/actor's Q&A thread on another forum, he's never heard of anyone getting sick from ass to mouth, and it's probably because most of the bacteria in the GI tract is present from one end to the other. The girls won't eat anything after noon the day before doing an anal scene, then they'll do a few enemas beforehand. Ass to vag, however, is a surefire way to get an infection.