"One of the newer marketing ploys in
pornography is called "ATM" ("ass to mouth"), where the male performer anally penetrates a woman and then sticks his penis into her mouth, often joking about her having to eat shit. In this pornography the code of debasement is most stark. There is no apparent increase in male
sexual pleasure by moving directly from the anus to the mouth outside of the
humiliation that the woman must endure."
(Robert Wosnitzer et al, 2006, "Aggression and Sexual Behavior in Best-Selling Pornography: A Content Analysis", p. 23)
Men who enjoy the suffering and humiliation of women (="ass to mouth"), are diagnosed with paraphilia ("
sexual deviancy" in scientific terms) according to the Diagnostic and Statistical Manual of Mental Disorders by the American Psychiatric
Association and the
International Statistical Classification of Diseases and Related Health Problems by the World Health Organization.