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. Others involve partners who naturally have a significant difference in size. Not all crush fetishists are that extreme! Fisting pornography features the insertion naked milf of an entire hand into a performer vagina or anus. Sometimes special furniture is used, such as a queening stool or smotherbox. Others may also use vibrators and other sexual devices more commonly associated with female masturbation. In the 1970s, the hardcore pornography genre introduced the stereotypical cumshot scene as a central element of the hardcore film, in which the male actor ejaculates in a way ensuring maximum visibility of the act itself. Enema pornography involves adults given enemas hentai porn to videos gays others, often fake. Hugo Ohira, director of marketing for Silvercash, rhetorically asks Who does not like spewing their load on a pretty young face? Babysitter pornography features usually teenage girls being exploited and having taboo sex with older, male employers. Masturbation has been depicted in art since prehistoric times and is mentioned and discussed in very early writings. Guro or Gore is a genre of Japanese pornography involving blood, gore, disfiguration, violence, mutilation, urine, enemas, or feces. Failure to honor a safeword is considered serious misconduct and could even change the sexual consent situation into a crime, depending on the relevant law, since the bottom has explicitly revoked his or her consent to any actions that follow the use of the safeword . There are currently no known laws forbidding the crushing of objects and insects, however the production or trade of crush erotica involving live vertebrates is condemned by animal rights activists and is illegal in many countries, including the United States and Great Britain. As with most forms of sexual activity, anal sex participants risk contracting sexually transmitted infections .
