Rough sex pornography is similar to pornography featuring sadomasochism, and typically features a Top who humiliates and/or degrades a Bottom while being physically violent towards them. See Gay-for-pay. The person sat upon may be in bondage, sexually submissive, or simply held down by the body-weight of the other person. Ethnic pornography is a genre of pornography that features performers of specific ethnic groups, or depictions of interracial sexual activity. POV pornography involves camera momsex angles designed to provide the viewer a view similar to that seen by one of the participants, whose face is never shown. The legal status of masturbation has also varied through history and masturbation in public is illegal in most countries. Spanking or whipping pornography involves spanking or whipping, generally of the buttocks, with the hand or with other objects such as belts, switches, paddles, brushes, or whips. Can also include auto-fellatio, or performing oral sex on oneself. While most tentacle erotica is animated, there are also a few live-action movies. As with most forms of sexual activity, anal sex participants risk contracting sexually transmitted infections . There are currently no known laws forbidding the crushing of objects and insects, however the production or trade of crush erotica gaysex involving live vertebrates is condemned by animal rights activists and is illegal in many countries, including the United States and Great Britain. Some couples use pornography at times for variety and to create a sexual interest or as part of foreplay. Common phrases used to refer to these individuals are chicks with dicks, trannies, or shemales, although these are generally considered pejorative slurs among transwomen. One-sided male nudity can also arise when a male disrobes as part of a male striptease. A smotherbox has two openings. This yields a view that would not be obtainable directly through the eyes of a person while experiencing the sex act. Interracial pornography typically employs ethnic and racial stereotypes in its depiction lesbian hentai of performers and many of interracial pornographic films still include racial stereotypes, although the segregation of actors by race has diminished considerably.