Reading or viewing pornography, sexual fantasy or other erotic stimuli may lead to a desire for sexual release such as by masturbation. Perhaps following the example set by gay pornography, they have become a popular subgenre within heterosexual pornography since the turn of the century, featuring both vaginal and anal ejaculations. It is typically animated pornography, as the legal age to be featured in a pornographic film in Japan is 18. Lesbian pornography typically features a wider momporn range of appearances and body types than is typical of mainstream pornography. Jeffrey Masson has even argued that incest porn is the very nucleus of pornography — its prototypical form. The current public acceptance of celebrities with sex tapes hentai movies is speculated by Joe Levy, executive editor of Rolling Stone, to be due to the easy availability of pornography, as well as couples more commonly making their own tapes due to the prevalence of video cameras. Often other friends and community members may witness the signing of such a document in a ceremony, and so parties violating their agreement can result in loss of face, respect or status with their friends in the community. Men with men Gay pornography is usually male homosexual pornography, acts depicted typically include anal or oral sex. Ass to mouth is a slang term primarily young gay porn used to describe the withdrawal of a penis from the receptive partner anus followed by the immediate insertion into the receptive partner mouth. It has since become popular enough with couples to be discussed during an episode of Sex and the City. HIV is among the infections that require such direct contact and is therefore very unlikely to be transmitted via mammary intercourse. Furthermore, the DSM-IV-TR notes, Fantasies, behaviors, or objects are paraphilic only when they lead to clinically significant distress or impairment . In contrast, a celebrity may take the route of openly releasing the tape and benefit directly from royalties as well as indirectly from the publicity.