The name was coined from milf fuck the title of the controversial hentai movies book. Solo performances in gay pornography have been described in 1985 as either or both active and/or passive , whereas female solo performances are said to be exclusively passive . For example, in Australia it is rated Refused Classification . Many fantasies include the macrophile shrinking before a normal sized woman or keeping his or her normal height while the partner grows in size. Evolutionary psychologists suggest that rounded buttocks may have evolved to be desirable trait because they provide a visual indication of the woman youth and fertility. Snowballing or snowdropping is the human sexual practice in which one gay sex video person takes someone else semen into his or her mouth and then passes it to the mouth of the other, usually through kissing. The existence of such content in commercially available pornography is widely considered an urban legend. People may experience pleasure from anal sex by stimulation of the anal nerve endings, and orgasm may be achieved through anal penetration – by indirect stimulation of the prostate in men, indirect clitoral/G-spot stimulation in women, and associated sensory nerves . 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. Sometimes one or more fingers may be inserted into the vagina to stroke its frontal wall where the G-spot may be located. Masturbation is the self-sexual stimulation of the genitals for sexual arousal or other sexual pleasure, usually to the point of orgasm. Lying face down one may use the hands, one may straddle a pillow, the corner or edge of the bed, a partner leg or some scrunched-up clothing and hump the vulva and clitoris against it. Among swinging couples, one of the two partners is often the driving force and the other is more passive-supportive of the addition of additional sex parties.