The sub-genres usually conform to certain conventions, and each may appeal to a particular audience. In places where non-monogamous sex is taboo or illegal, group sex may take place in private or clandestine locations including homes, hotel rooms, or private clubs. In these cases, the appearance of an enlarged abdomen caused by obesity or overeating may be sufficient, or simply the suggestion of a protruding navel. The meaning of hentai is perversion, abnormality, or metamorphosis. Unlike Yaoi, Bara is normally made by actual homosexual men, for homosexual men, and tends to focus on the more realistic obstacles and challenges that come with being homosexual in Japan. Although macrophilia literally translates to simply a lover of large, in the context of a sexual fantasy it is used to mean someone who attracted to beings larger than themselves. Pornographic films are generally classified into sub-genres which describe the sexual fantasy which the film and actors attempt to create. Foot fetishism, foot partialism, foot worship, or podophilia is a pronounced sexual interest in feet. The films were financially successful, winning AVN Awards for the best gay twinks selling pornographic films of their year; however the events were effectively un-officiated and the record breaking nude milfs claims often misleading. But starting with The World Biggest Gangbang , starring Annabel Chong, the pornographic industry began producing a series of films ostensibly setting gangbang records for most consecutive sex acts by one person in a hentai porn short period. Male masturbation may differ between males who have been circumcised and those who have not. For their consent, they must have relevant information at hand and the necessary mental capacity to judge. The effect is to give the viewer the sense that they are experiencing the sex acts that they are watching, as opposed to simply watching others as a voyeur. The Japanese sex industry uses the term Paizuri . 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.