However the genre remains a very small proportion of the pornographic DVD market; for example at porn retailer HotMovies. A large part of the popularity of these videos is seeing how regular and normal the girls are in real-life. Male masturbation may differ between males who have been circumcised and those who have not. While most tentacle erotica is animated, there are also a few live-action movies. Bukkake pornography usually gaysex depicts numerous men having sex with one woman, with multiple, usually 10 or more, men ejaculating on the female face. Clothed female, naked male is a genre of erotica hentai sex featuring one or more nude men and one or more clothed women. Can also include auto-fellatio, or performing oral sex on oneself. Emetophilia big tit milf pornography involving vomiting and gagging. Guro or Gore is a genre of Japanese pornography involving blood, gore, disfiguration, violence, mutilation, urine, enemas, or feces. Transsexual people Transman pornography features performers who were born female and who medically transitioned to male. Enema pornography involves adults given enemas to others, often fake. Fistees who are more experienced may take two fists . Hentai is the various forms of Japanese pornography, including H-manga, H-anime, and H-computer games. Fetish cuckolding can have a wide range of expression, from pillow-talk fantasy between monogamous partners to extreme alternative lifestyles, depending on the couple. Some BDSM practitioners prefer a code of behavior that differs from SSC and is described as risk aware consensual kink , indicating a preference for a style in which the individual responsibility of the involved parties is emphasized more strongly, with each participant being responsible for his or her own well-being. It may involve sexual attraction to women who are pregnant or appear pregnant, attraction to lactation, or attraction to particular stages of pregnancy such as impregnation or childbirth. Some productions are noted for sophisticated and/or experimental storytelling and animation techniques.