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. It is used, for example, at fertility clinics to stimulate sperm donors. Group sex is sexual behavior involving more than two participants. Related genres include: Amateur pornography originally referred only to pornography produced by amateurs but now also includes professionally made pornography designed to appear as if it were amateur. The consent and compliance for a sadomasochistic situation can be granted only by people who can judge the potential results. These scenes may involve the female actor calling for the shot to be directed at some specific part of her body. Although interracial pornography theoretically can apply to depictions of sexual activity between performers of any different racial groups, the term is most commonly used for heterosexual sex acts between black and white performers. A variation on this is to place the fingers and thumb on the penis as if playing a flute, and then shuttle them back and forth. Facial cum shots are currently regularly portrayed in pornographic films and videos, often as a way to close a scene. BDSM actions can often take place during a specific period of lesbian hentai time agreed to by both parties, referred to as play, a scene or a session. This fetish sometimes originates from childhood memories of needing, or of seeing another needing, to urinate. Each participant may engage in any type of sex acts with one or both of the others, such as vaginal, anal or oral sex or mutual horny milfs masturbation. A few extremely flexible males can reach and stimulate gay twink porn their penis with their tongue or lips, and so perform autofellatio. Transsexual people Transman pornography features performers who were born female and who medically transitioned to male. Some BDSM practitioners prefer a code of behavior that differs from SSC and is described as risk aware consensual kink , indicating a preference for a style in which the individual responsibility of the involved parties is emphasized more strongly, with each participant being responsible for his or her own well-being.