Homi Bhabha defined the idea of a racial fetish in contrast to the idea of the Freudian sexual fetish which he describes a denial of difference, where the male sees the female as a castrated male, seeing missing parts rather than a different anatomy. The term hentai is never used in this context in Japanese. Mammary intercourse is said by Alex Comfort to produce mutual orgasm in women with sensitive breasts , and it was one of momporn the nine substitute exercises for penetrative sexual activities, as detailed in the Paradis Charnels of 1903. Initially, few animation studios in the United States attempted to produce animation for adult audiences, but later examples of animation produced for adults would gain mainstream attention and success. Consent is lesbian hentai the most important criterion here. Although pornography has usually focused on heterosexuality, due to the prevalence of the heterosexual orientation, explicit hot gay sex gay material has a long history as well, which reaches back to Greek antiquity, if not to prehistory. As with most forms of sexual activity, anal sex participants risk contracting sexually transmitted infections . Transsexual pornography features transwomen performers, who typically have male genitalia and augmented female breasts . Boot fetishism is a sexual fetish dedicated to boots. Real enema shots or videos of true medical situations may violate privacy laws in some countries. 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 . For other scenes, particularly in established relationships, a safeword may be agreed to signify a warning rather than explicit withdrawal of consent; and a few choose not to use a safeword at all. The anus has a relatively high concentration of nerve endings and can be an erogenous zone, and the receiver may receive pleasure from external anal stimulation.