Lesbianism has been a theme in erotic art since at least the time of ancient Rome, and many regard depictions of lesbianism to be erotic. The genres of pornography are based on the type of activity featured and the category of participants, for example mateur pornography is a category of pornography that features models, actors or non-professionals performing without pay, or actors for whom this material is their only paid modeling work. Bottom and submissive are widely recognized terms for those partner in the relationship or activity who are, respectively, the physically receptive or controlled participants. Shibari is a Japanese word that literally means to tie or to bind. Cuckold fetish pornography that involves a cuckolded husband. Since the 1980s, many practitioners and organizations have adopted the motto safe, sane and consensual, commonly abbreviated as SSC, which means that everything is based on safe activities, that all participants be of sufficiently sound/sane mind to consent, and that all participants do consent. Interracial pornographic films have experienced an explosion in popularity, becoming one of the fastest-growing gay sex video and biggest-selling 3d hentai genres. It spawned numerous sequels, several of which won adult film awards. Female ejaculation is the expulsion of fluid by the paraurethral ducts through and around the human female urethra during or before an orgasm. In Japanese, this natural-fibre rope is known as asanawa; the Japanese vocabulary does not make a distinction between hemp and jute. Kinbaku means tight binding Kinbaku-bi which literally means the beauty of tight binding. It has also been recommended as a form of foreplay or safer sex. Creampie scenes depart milf fuck 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 existence of such content in commercially available pornography is widely considered an urban legend.