In the attempts of circumvent this type of censoring , actors and producers have featured subject matter unseen or rarely depicted in western pornography. Facesitting is common among dominant and submissive individuals, for demonstrating superiority and for sexual gratification. Fistees who are more experienced may take two fists . Ethnic pornography is a genre naked milf of pornography that features performers of specific ethnic groups, or depictions of interracial sexual activity. Erotic literature and pornographic films have been devoted to the sexual uses of glory holes. In D/S, the Dominant is the Top and the submissive is the Bottom. In general, softcore pornography is pornography that does not depict explicit sexual activity, sexual penetration or extreme fetishism. RACK may be seen as focusing primarily upon awareness and informed consent, rather than accepted safe practices. Solo pornography features performers masturbating. In the United States, creating, distributing, or possessing crush videos has been illegal since 1999, and many other countries also have banned them. A smotherbox has two openings. BDSM videos porno gay has become an umbrella term for certain kinds of erotic behavior between consenting adults. The term hamedori came into use about 1988–1989, but it was only a small niche area until it was popularized at V&R Planning by director Company Matsuo. Interracial pornographic films have experienced an explosion in popularity, becoming one of the fastest-growing and biggest-selling genres. It has been described as professionally made porn which seeks to emulate the style of amateur pornography. Pegging is a recently invented word which features a woman penetrating a man with a strap-on dildo. Often, slave contracts are set out in writing to record the formal consent of the parties to the power exchange, stating their common vision of the relationship dynamic. Individuals who can change between top/dominant and bottom/submissive hentai movies roles—whether from relationship to relationship or within a given relationship—are known as switches, though the term switch in this context is occasionally seen as derogatory and is rejected by many who might simplistically fit the definition.