John Stagliano is considered to have started the gonzo pornography genre with his Buttman series of films. This industry employs thousands of performers along with support and production staff. In human sexuality, a threesome is sexual activity that involves three people at the same time. Use of the agreed safeword is seen by some as an explicit withdrawal of consent. The term Asiaphile is sometimes used to describe the same phenomenon as is yellow fever . People may engage in anilingus for its own sake, before anal fingering or penetration, or as part of foreplay. Clothed male, naked female is one-sided female nudity in which one or more females are nude while one or more men are clothed. It contains graphic sexual momporn activity and visible penetration. Examples of mentally oriented practices are gay sex video education games, during which the dominant requires certain forms of behavior from the submissive. The work of Bruce Seven has been called reality porn, due to his lack of using scripts and asking his performers to act naturally in their own character. The porn industry and viewing public were shocked by the then-taboo spectacle of a white woman having sex with a black man. Sadomasochism hentai videos is practiced in isolation relatively rarely, though some masochists report biting, pinching, or even stun-gunning themselves as a prelude to, or as part of, masturbation. Sexologist Alfred Kind suggested that the buttocks is the primary sexual presentation site in primates. Bottom and submissive are widely recognized terms for those partner in the relationship or activity who are, respectively, the physically receptive or controlled participants. For example, in Australia it is rated Refused Classification . In general, BDSM play is usually structured such that it is possible for the consenting partner to withdraw his or her consent during a scene; for example, by using a safeword that was agreed on in advance. Examples include the Girls Gone Wild and Girls Who Like Girls Series. Creampie scenes depart from heterosexual pornographic convention in favor of a depiction that more closely mimics sexual intercourse as performed in ordinary life; they have been called the counterimage of facials.