The activity is done by itself or as a part of or prelude to other activities which many times involve sex. The two sets of people involved often meet either randomly or arrange to meet up beforehand over the Internet. Diaper fetishism, nappy fetishism or diaperism, is a sexual fetish in which a person feels lesbian milfs a desire to wear or use diapers. Examples of mentally oriented practices are education games, during which the dominant requires certain forms of behavior from hentai porn the submissive. In Japan, point of view pornography is referred to as hamedori . During anal sex, male pleasure can be particularly derived from the prostate, which can lead to an orgasm and ejaculation. Patricia Hill Collins, an African-American writer, theorizes that this is derived from a stereotype that those of black descent are promiscuous, and their buttocks are objectified by porn as a result. Barebacking usually refers to a conscious and deliberate choice to forgo condoms. For a foot fetishist, points of attraction include the shape and size of the foot and toes , jewelry , treatments , state of dress , odor, and sensory interaction . Bukkake pornography involves a performer, usually female, gay boy porn onto whom several men or women ejaculate, usually on the face. In POV porn, the shooting style is generally similar to gonzo pornography, with the person receiving sexual gratification holding the camera him or herself—aiming it down at the actress or actor who is performing the sex act. Group sex most commonly takes place in a private sex party or semi-public swinger gathering, but may also take place at massage parlors or brothels or, in some jurisdictions, at purpose-built locations such as sex clubs. The industry generally refers to such films as adult films, which is part of adult entertainment. Reality pornography is a genre of pornography where staged scenes, usually shot in cinéma vérité fashion, set up and precede sexual encounters. The term bondage describes the practice of Physical restraining.