Oral sex pornography frequently features a person performing fellatio, and less frequently cunnilingus. Biological anthropologist young gay porn Helen B. The existence of such content in commercially available pornography is widely considered an urban legend. Likewise, Fox Broadcasting Company has also dedicated an entire evening programming block to adult animation programs, known as Animation Domination. Both forms of pornography generally contains nudity. The name is a reference to gonzo journalism, in which the reporter is part of the event taking place. In S/M, the Sadist is usually the Top and the Masochist the Bottom, but these roles are frequently more complicated or jumbled . The genres of pornography are based on the type of activity featured and the category of participants, for example mateur pornography is a category of pornography that features models, actors or non-professionals performing without pay, or actors for whom this material is their only paid modeling work. For instance, Amateur Allure has a trademark shot where the sexually performing cameraman circles a handycam around the sexually performing model head. The phrase buttered bun is sometimes used to refer to the owner of the orifice in question. Use of the agreed safeword is seen by some as an explicit withdrawal of consent. Some men also enjoy anal stimulation, with momsex fingers or otherwise, without any prostate stimulation. The term is typically used by the cinematographer within the narrative framework of a pornographic film, and since the 1970s has become a leitmotif of the hardcore genre. The term applies to the depiction of the act rather hentai movies than the act itself, and so does not include live exhibitions like sex shows and striptease. The most common type of erotic spanking is administered on the bare buttocks, but can also be combined with bondage, in order to heighten sexual arousal and feelings of helplessness. Internal ejaculation shots are a comparatively recent development in pornography; they are not found in early pornographic films.