While most tentacle erotica is animated, there are also a few live-action movies. Transsexual pornography features transwomen performers, who typically have male genitalia and augmented female breasts . Arguably the most famous example of the genre is the Taboo series. The sub-genres usually conform to certain conventions, and each may appeal to a particular audience. Unlike the traditional definition of the term, in fetish usage a cuckold is complicit in their partner sexual infidelity and takes masochistic sexual pleasure in it. Using the term shemale for a transsexual woman often implies that she is working in the sex trade. The term is a slang word that originated in the gay community and comes from the equestrian term hot gay sex bareback, which refers to the practice of riding a horse without a saddle. The essence of voyeurism is the observing but may also involve the making of a secret photograph or video of the subject during an intimate activity. It is sometimes described as a sexual fantasy, by women or men, depicting an exhibitionist or physique worship scenario. Technically this is a form of exhibitionism rather than group sex per se. The person sat upon may be in bondage, sexually gay hentai submissive, or simply held down by the body-weight of the other person. The first pegging scene appears to have been in the non-pornographic 1970 film Myra Breckinridge, based on the novel of the same name by Gore Vidal, although it was not explicit. Bukkake pornography usually depicts numerous men having sex with one woman, with multiple, usually 10 or more, men ejaculating on the female face. In addition to mainstream pornography, the popularity of facials nude milfs has led to creation of its own niche market, like video series that specialize in showing the act. Bukkake videos are a relatively prevalent niche in contemporary pornographic films. Real enema shots or videos of true medical situations may violate privacy laws in some countries. Others may also use vibrators and other sexual devices more commonly associated with female masturbation.