Such explicit sexual interaction is seen only rarely in public play spaces, and it is sometimes specifically banned by the rules of a party or playspace. Bukkake, Gokkun, Omorashi, and tentacle erotica are few uniquely Japanese genres known to western viewers. BDSM actions can often take place during a specific period of time agreed to by both parties, referred to as play, a scene or a session. The first pegging scene appears to have been in the non-pornographic 1970 film Myra Breckinridge, based on the novel of the same name by Gore Vidal, although it was not explicit. However the genre remains a very small proportion of the pornographic DVD market; for example at porn retailer HotMovies. If ejaculation is onto the other person face it can be called a facial. Group sex can occur between people of all sexual orientations and genders. Omorashi: The act of holding one own urine until the need to urinate is urgent, making another hold in their urine, or watching another person with an urgent need to urinate. Crying pornography that features participating actors anime hentai crying. As of 2013, little analysis of this paraphilia has been reported in medical literature. Masturbation has been depicted in art since prehistoric times and is mentioned and discussed in very early writings. Fantasies of group sex are extremely common among both men and women, and group sex is a subgenre in pornographic films. Other possibilities are possible, such as a man having sex with two women who are having sex with each other. See Gay-for-pay. Often a dominant woman, she may be called a Dom, Domme /ˈdɒm/, Femdomme, Domina, or Dominatrix, depending on context or personal preference. It may be used as foreplay, or as an alternative to sexual penetration. In more vigorous forms of fisting, such as punching or punchfisting, a fully clenched fist may be inserted and withdrawn slowly. It may be regarded as taboo or unnatural, and is a criminal offense in some countries, gay movies punishable by corporal or capital punishment; by contrast, people also regard anal sex as a natural and valid form of sexual activity that may be as equally fulfilling as any other desired sexual expression.