Irrespective of the legal or social view of pornography, it has been used in a number of contexts. Although there may be no connection between coprophilia and sadomasochism , the limited data on the former comes from studies of the latter. Foot fetishism has been defined as a pronounced sexual interest in the feet or footwear. Following the introduction of the Motion Picture Association of America film rating system, independent animation producers attempted to establish an alternative to mainstream animation. Two women tapegagged and cuffed lesbian hentai to iron bars Bondage and Discipline are two aspects of BDSM that do not seem to relate to each other because of the type of activities involved, but they have conceptual similarities, and that is why they appear jointly. 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 gay twinks usual separation between camera and performers seen in conventional porn and cinema. 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. Kurt Wild, who appeared as a bottom in Lucas Entertainment Gigolos, is married to a woman and has three children. Pro-am pornography is sub-genre of amateur pornography that refers to professionally made porn that features amateur actors/actresses, often appearing for the first time in a pornographic film. The term sadomasochism is derived from momporn the words sadism and masochism . This genre also features male-on-male fellatio through a small hole made in a bathroom divider. Voyeur pornography may also include shots of topless women on topless beaches who are unaware of the cameras but may legally be photographed due to the public setting. The term BDSM dates back to 1969; however, the origin of the term BDSM is unclear and is believed to have been formed either from joining the term B&D with S&M , or as a compound initialism from B&D, D&S , and S&M.