During anal sex, male pleasure can be particularly derived from the prostate, which can lead to an orgasm and ejaculation. Some pornographic films use an artificial semen substitute to simulate or enhance creampie shots. Preggo pornography features pregnant performers and may include erotic lactation as a fetish. This genre also features male-on-male fellatio through a small hole made in a bathroom momsex divider. Reading or viewing pornography, sexual fantasy or other erotic stimuli may lead to a desire for sexual release such as by masturbation. The term has also applied to other professions and even companies trying to appeal to a gay demographic. Coprophilia , also called scatophilia or scat , is the paraphilia involving sexual arousal and pleasure from feces. Evolutionary psychologists suggest that rounded buttocks may hentai movies have evolved to be desirable trait because they provide a visual indication of the woman youth and fertility. By comparison, gonzo pornography puts the camera right into the action, often with one or more of the participants both filming and performing sexual acts, without the usual separation between camera and performers seen in conventional porn and cinema. Positions can also be chosen specifically for added effects such as increased humiliation, elevation and suspension. Use of the agreed safeword is seen by some as an explicit withdrawal of consent. Sadomasochism refers to the aspects of BDSM surrounding the exchange of physical or emotional pain. It is also followed by dedicated industry publications and trade groups as well as the mainstream press, private organizations , government agencies, and political organizations. Some masturbate only using pressure applied to the clitoris without direct contact, for example by pressing the palm or ball of the hand against underwear or other clothing. Cartoon pornography includes, but is not limited to, hentai and parody renditions of famous cartoons and comics. Lesbian pornography typically features a wider gay cock range of appearances and body types than is typical of mainstream pornography.