A2M

Ass to mouth is a colloquial term, in sexology and pornography, for the removal of the penis or another object from the passive partner's anus followed by the immediate insertion of the penis or object into the passive partner's or another partner's mouth. It is also known as A2M or ATM. Ass to mouth generally excludes cleaning the penis or other object after its removal from the anus and before its insertion into the mouth. A2OGM, for "ass to other girl's mouth", specifically describes the variant of the act where the penis is moved to another female partner's mouth.

Prevalence in pornographic videos
Ass to mouth became something of a fad around 2003 or 2004 in American pornographic videos. Various explanations have been given for this trend, but one reason predominates in feminist literature. Ass to mouth generally occurs in videos targeted to heterosexual men in which men dominate women, at least to a certain extent. Thus, ass to mouth is a practice through which a man (or men) degrade a woman (or women) by requiring her to taste her own fecal matter, generally on a man's penis. This act both gives the man physical pleasure, degrades the woman, and requires her to work to service him. It should be added that the fecal matter present is almost always so small as to be invisible to the naked eye. Indeed, the visible presence of feces on an actor's penis before ass to mouth would be enough to turn most ass to mouth fans off. Ass to mouth is not to be confused with Coprophilia. An actress's anus and rectum are always thoroughly cleaned before such scenes.

The increase in pornographic videos featuring ass to mouth is probably due to the fact that while films containing anal sex were once relatively rare, anal sex is now quite common in pornographic videos marketed to heterosexual men. In order to continue to be shocking, such videos sometimes rely on more obscure sex acts that many would consider degrading in order to elicit a strong reaction from their audience. After all, ass to mouth occurs most commonly in pornographic videos in which men are depicted as dominating and degrading women for the erotic pleasure of the audience. Many men and women find these practices offensive, while others find them extremely erotic.

The act was originally popularized by Max Hardcore in his "Cherry Poppers" series of adult films in the early '90s, and perfected by Alisha Klass and Samantha Stylle in Seymore Butts's pornographic movies circa the mid-to-late '90s. Klass would frequently take the lead in ingestion, either from her posterior or another woman's; she was a submissive and eager participant who had in fact tattooed Butts's name on her lower back so as to be seen during anal sex shots. Actress Briana Banks is known for performing this fetish in her adult movies. The actress known as Jessica Darlin is featured performing the act often.

"Extreme" ass to mouth pornographic videos
In a rare and very extreme form of ass to mouth found in some fetish-themed or scatologically-themed heterosexual pornographic videos, the woman does not undergo an enema or otherwise clean her rectum prior to anal sex. As a result of this, the man's penis is visibly smeared with her fecal matter when she takes it into her mouth. While this practice exists inside of pornographic videos, it is almost unheard of outside of this particular context.