As in B/D, the declaration of the Top/Bottom may be required, though sadomasochists may also play without any Power Exchange at all, with both partners equally in control of the play. Amateur porn has been called one of the most profitable and long-lasting genres of pornography. The term is a slang word that originated in the gay community and comes from the equestrian term bareback, which refers to the practice of riding a horse without a saddle. Generally, interest differs between people, and gender depends on sexual orientation. Since development and pronunciation of the buttocks begins at menarche and declines with age, full buttocks are also a symbol of youth. Facial cum shots are currently regularly portrayed in pornographic films and videos, often as a way to close a scene. People may engage in anilingus for its own sake, before anal fingering or penetration, or as part of foreplay. Internal ejaculations, followed by images of semen dripping from the anus, are sometimes depicted in bareback gay pornography, where they are referred to by the term breeding or the reverse money shot. The consent and compliance for a sadomasochistic situation can be granted only by people who can judge the potential results. For legal gay hentai reasons, the vast majority of so-called reality porn involves momporn professional actors and actresses posing as so-called videos porno gay amateurs. The rise of the Internet in the late 1990s and early 2000s similarly changed the way pornography film was distributed and furthermore complicated the censorship regimes around the world and the legal prosecution of obscenity. Some restrict a policy of panties/nipple tape for females and some allow full nudity with explicit sexual interaction allowed. These scenes may involve the female actor calling for the shot to be directed at some specific part of her body. The prostate gland is one of the organs that contributes fluid to semen. The smotherbox is placed on a stable surface. Such explicit sexual interaction is seen only rarely in public play spaces, and it is sometimes specifically banned by the rules of a party or playspace.