Internationally, hentai is a catch-all term to describe a genre of anime and manga pornography. The purpose of this kind of agreement is primarily to encourage discussion and negotiation in advance, and then to document that understanding for the benefit of all parties. His most famous model was Bettie Page, who became the first celebrity of bondage film and photography. Sadomasochism refers to the aspects of BDSM surrounding the exchange of physical or emotional pain. It has since become popular enough with couples to be discussed during an episode of Sex and the City. It is typically animated pornography, as the legal age to be featured in a pornographic film in Japan is 18. Following the introduction of the Motion Picture Association of America film rating system, independent animation producers attempted to establish an alternative to mainstream animation. Bra pornography involves women or men dressed in bras. Lolita pornography that features actual teenage girls under the age of 18 is illegal in most countries and treated as child or youth pornography. It may occur more frequently in private situations, such as spontaneous sexual activity among three friends, or arranged in a community of like-minded swingers or planned as a once-only experience; and rarely in anonymous settings, such as at orgies or other sex gay sex videos parties. Pegging films include Strap It On , Babes Balling Boys , Strap Attack, Strap-on Sirenz, Strap-on Chicks, Boss Bitches , various movies produced by LEDA Studios, and San Francisco-based Men In Pain. The slave is usually strictly forbidden from placing their lips directly on the body of the dominant so the practice routinely involves them receiving much of the spray all over their face, hair and body, however, another way of doing this that applies mostly to male dominants, is to place the mouth on the head of the penis and drink the urine as it is released. Particularly, some pornography in this genre features butch women, who are almost never seen in mainstream pornography.