Ethnic pornography is a genre of pornography that features performers of specific ethnic groups, or depictions of interracial sexual activity. Weather Report Girl is considered yuri hentai in English usage for its depiction of lesbian sex, but in Japan it is just yuri. Clothed female, naked male is a genre of erotica featuring one or more nude men and one or more clothed women. The anal and rectal tissues videos porno gay are delicate and do not provide natural lubrication, so they can easily tear and permit disease transmission, especially if lubricant is not used. Pornographic films or sex films are films that present sexually explicit subject matter for the purpose of sexual arousal and erotic satisfaction of the viewer. The surfacing of sex tapes has become so common that some are leaked as a marketing tool to advance or establish a media career. Individuals who can change between top/dominant and bottom/submissive roles—whether from relationship to relationship or within a given relationship—are known as switches, though the term switch in this context is occasionally seen as derogatory and is rejected by many who might simplistically fit the definition. However the genre remains a very small proportion of the pornographic DVD market; for example at porn retailer HotMovies. For example, the Kama Sutra, in particular, goes into specific milf fuck detail on how to properly strike a partner during sex. Others involve partners who naturally have a significant difference in size. It generally contains nudity or partial nudity in sexually suggestive situations. Arguably the most famous example of the genre is the Taboo series. The Japanese sex industry uses the term Paizuri . Felching involves drinking recently ejaculated semen from the vagina or anus. Bukkake pornography usually depicts numerous men having sex with one woman, with multiple, usually 10 or more, men ejaculating on the female face. Bukkake videos are a relatively prevalent niche in contemporary pornographic films. Seconds after being deposited onto the face, the semen thickens, before liquefying hentai sex 15–30 minutes later.