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. The term momporn is typically used by the cinematographer within the narrative framework of a pornographic film, and since the 1970s has become a leitmotif of the hardcore genre. Clothes wetting: The person is sexually aroused by wetting one clothing or observing another person doing so. Since mammary intercourse is a non-penetrative sex act, the risk of passing a sexually transmitted infection that requires direct contact between the mucous membranes and pre-ejaculate or semen is greatly reduced. The definition clash also appears with the English definition of yuri as any lesbian relationship, as opposed to its sexually explicit definition in Japan. The term applies to the depiction of the act rather than the anime hentai act itself, and so does not include live exhibitions like sex shows and striptease. It contains graphic sexual activity and visible penetration. What seems clear from the historical record is that much of the lesbian material in pornographic texts was intended for a male readership. Female dominance refers to BDSM relationships and BDSM scenes in which the dominant partner is female. Pornography may fall into more than one genre. Female ejaculation is the expulsion of fluid by the paraurethral ducts through and around the human female urethra during or before an orgasm. The phrase buttered bun is sometimes used to refer to the owner of the orifice in question. Men may find stimulation of the anus, gay twinks rectum, and adjacent organs enjoyable. The concept of lesbian, to differentiate women with a shared sexual orientation, celebrity porn is a 20th-century construct. Pussing: British expression for an activity involving a consenting couple where the male partner watches the woman urinate otherwise undetected in a semi-public place, usually a toilet cubicle at a pub, hotel, restaurant, theatre/cinema, office, club etc.