There is also some evidence that pornography can be gay bear porn used to treat voyeurism. Teacher and Student or Boss and Secretary pornography involves sexualized situations which take place between an authority figure, such as a teacher or boss, and an underling, such as a student or secretary, often fake. Guro or Gore is a genre of Japanese pornography involving blood, gore, disfiguration, violence, mutilation, urine, enemas, or feces. Matsuo used amateur actresses in his videos, and he usually traveled to their hometowns for the filming. Such films continued to be produced but could only be distributed by underground channels. The exact source and nature of the fluid continue to be a topic of debate among medical professionals, gay hentai which is also related to doubts over the existence of the G-Spot. An orgy is a gathering where guests freely engage in open and unrestrained sexual activity or group sex; and a bunga bunga orgy is an orgy in which participants have sex underwater, such as in a swimming pool or a hot tub. Sadomasochism does not imply enjoyment through causing or receiving pain in other situations . Others involve partners who naturally have a significant difference in size. Another variant of reality pornography consists of normal couples that are filmed by professionals, in which case the only obvious distinction from amateur pornography is the higher quality of production, filming and editing. Pornographic films are generally classified into sub-genres which describe the sexual fantasy which the film and actors attempt to create. Fisting involves the insertion of one partner entire hand into a vagina or the anal cavity. A sexual fetish may be regarded as an enhancing element to a romantic/sexual relationship achieved in ordinary ways or as a mental disorder/disorder of sexual preference if it causes significant psychosocial distress for the person or has detrimental effects on important areas of their life. The stimulation may involve hands, fingers, porn milf everyday objects, sex toys or combinations of these.