For the medical term for the pathogen transmission route, see Fecal–oral route. For the practice observed biologically of species feeding from one another's anus, see Trophallaxis. For the use of the mouth to stimulate the anus, see anilingus.
Ass to mouth (abbreviated as ATM or A2M in pornography) is a slang term associated with the porn industry describing anal sex immediately followed by oral sex. The term is primarily used to describe a sexual practice whereby an erect penis is removed from a receptive partner's anus and then directly put into their mouth, or possibly the mouth of another.[1]
^Robert Jensen, Ph.D. "Just a John"(PDF). The University of Texas at Austin. Archived from the original(PDF) on 2008-05-10. Retrieved 2007-01-08.