A celebrity may allow such a recording to surface willingly, as part of a publicity stunt. Incest pornography can feature actual relatives, but the main type of this pornography simply uses actors of similar looks to suggest family relationship. This may relate to fetishes such as voyeurism or cuckolding. Lesbianism has been a theme gaysex in erotic art since at least the time of ancient Rome, and many regard depictions of lesbianism to be erotic. The term lesbian is also used with regard to sexual identity or sexual behavior, regardless of sexual orientation, or as an adjective to characterize or associate nouns with female homosexuality or same-sex attraction. The scenario is a genre of erotica, which on the internet is sometimes abbreviated to CMNF, and may involve sexual and nonsexual erotic scenarios. Tentacle rape or shokushu goukan is found in some horror or hentai 3d hentai titles, with tentacled creatures having sexual intercourse with female characters. 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 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. Cuckold fetish pornography that involves a cuckolded mature milfs husband. Jerk off instruction features a performer encouraging or instructing the viewer to masturbate, often culminating in a countdown at the end of which the viewer is invited to induce orgasm. Participants usually derive pleasure from this, even though many of the practices—such as inflicting pain or humiliation or being restrained—would be unpleasant under other circumstances. This can, however, redirect semen into the bladder .