They further argue that setting a discrete line between safe and not-safe activities ideologically denies consenting adults the right to evaluate risks vs rewards for themselves; that some adults will be drawn to certain activities regardless of the risk; and that BDSM play—particularly higher-risk play or edgeplay—should be treated with the same regard as extreme sports, with both respect and the demand that practitioners educate themselves and practice the higher-risk activities to decrease risk. This fetish sometimes originates from childhood memories of needing, or of seeing another needing, to urinate. 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. The term combines elements of the Freudian psychoanalytic fetish and the Marxist commodity nude milfs fetish, and is used in the context of British, Spanish and French colonialism and imperialism and their aftereffects. Women porn is often produced by women and aimed specifically at the female market - rejecting the gay twinks view that men are turned on by porn but women only by a box of chocolates. The concept of lesbian, to differentiate women with a shared sexual orientation, is a 20th-century construct. In human sexuality, a threesome is sexual activity that involves three people at the same time. Femdom features BDSM scenes in which the dominant partner is female. A somewhat controversial ejaculation control technique is to put pressure on the perineum, about halfway between the scrotum and the anus, just before ejaculating. Transgender pornography features performers who cross-dress lesbian hentai for sexual gratification, ei celebrity porn ther for themselves or for their partners. Sexual relations between women have been illustrated as well as narrated, but much of the written material from the early modern period has been destroyed. 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.