The consensual submission of the submissive is sometimes demonstrated to others by symbols indicating his/her belonging to the dominant, such as wearing a collar, special tattoos, piercings, a very short haircut or a bald head. Works in this genre may explore philosophical, political or social issues. A 2009 study found that heterosexual male fat admirers preferred females that were clinically overweight and rated both overweight and obese women more positively than slighter individuals. In general, as compared to conventional relationships, BDSM participants go to great lengths to negotiate the important aspects of their relationships in advance, and to take great care in learning about and following safe practices. In Japanese, the term describes any type of perverse or bizarre sexual desire or act; it does not represent a genre of work. Point of view pornography is adult entertainment filmed to look as if the watcher were experiencing the sex act themselves. The two sets of people involved often meet either randomly or arrange to meet up beforehand over the Internet. A scene where many women have sex with one man is referred to as a reverse gang-bang. It has since become popular enough with couples to be discussed during an episode of Sex and the City. A heterosexual threesome may involve two men and a woman, big tit milf or one man and two women - that is, two men having sex with a woman , or two women with a man. Cartoon pornography gay bear porn depicts illustrated or animated fictional characters in erotic and sexual situations. Drama Hardcore showed this kind of film on its film. Low et al. A facial is a term for the sexual activity in which a man ejaculates semen onto the face of one or more sexual partners. Women with women Main article: Lesbianism in erotica: Lesbianism in contemporary pornography Lesbian lesbian hentai or girl-girl pornography features women engaged in sex together, but is typically aimed at a male audience. A pornographic work is characterized as hardcore if it has any hardcore content.