See Gay-for-pay. Bukkake pornography usually depicts numerous men having sex with one woman, with multiple, usually 10 or more, men ejaculating on the female face. This is also the case in many relationships not considering themselves as sadomasochistic; hentai movies it is considered gaysex to be a part of BDSM if it is practiced purposefully. The 1979 U. Enema pornography involves adults given enemas to others, often fake. The term has as its origins Frantz Fanon epidermal schema and Edward Said Orientalism. Typically features a feminine Uke, or submissive, horny milfs and a masculine Seme, or dominative. 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. Making a pearl necklace is one of the activities that sex workers use as safe sex alternatives for people who refuse to wear condoms. Common phrases used to refer to these individuals are chicks with dicks, trannies, or shemales, although these are generally considered pejorative slurs among transwomen. However, the tradition of bondage magazines continues in the form of art books of bondage photographs, published by mainstream publishers such as Taschen. Pornography can be classified according to the physical characteristics of the participants, fetish, sexual orientation, etc., as well as the types of sexual activity featured. However the genre remains a very small proportion of the pornographic DVD market; for example at porn retailer HotMovies. Softcore pornography generally contains nudity or partial nudity in sexually suggestive situations, but without explicit sexual activity, sexual penetration or extreme fetishism, while hardcore pornography may contain graphic sexual activity and visible penetration, including unsimulated sex scenes. Male masturbation may differ between males who have been circumcised and those who have not.