Transsexual pornography is a genre of pornography. Ass to mouth pornography shows the transfer of a performer penis from a second performer anus to that same second performer mouth in a single shot. Sex parties may be organized to enable people to engage in casual sexual activity or for swinging couples or people interested in group sex to meet, but any gathering where sexual activity is anticipated can be called a sex party. The smotherbox is placed on a stable surface. Shibari is a Japanese word that literally means to tie or to bind. Sexologist Alfred Kind suggested that the buttocks is the primary sexual presentation site in primates. Participants who exert sexual control over their partners are known as dominants or tops while participants who take the passive, receiving, or obedient role are known as submissives or bottoms. A sub-set milf xxx of vaginal fisting attempts to photograph the female cervix immediately after the fist is removed from the now-gaping vagina. It has also been recommended as a form of foreplay or safer sex. Portrayals of lesbians in the media suggest that society at large has been simultaneously intrigued and threatened by women who challenge feminine gender roles, and fascinated and appalled with women who are romantically involved with other women. Comic books often featured characters being tied up and tying others up, particularly in damsel in distress plots. Urolagnia is a form of salirophilia in which sexual excitement is associated with the sight or thought of urine or urination. Related genres include: Amateur pornography anime hentai originally referred only to pornography produced by amateurs but now also includes professionally made pornography designed to appear as if it were hentai porn pics amateur. Some may keep their hand stationary while pumping into it with pelvic thrusts in order to simulate the motions of sexual intercourse. Pro-am pornography is sub-genre of amateur pornography that refers to professionally made porn that features amateur actors/actresses, often gay twink porn appearing for the first time in a Celebrity Porn pornographic film.