There is, however, no third party camera work involved. John Stagliano is considered to have started the gonzo pornography genre with his Buttman series of films. This makes varying degrees of stimulation an integral part of oral sex for many men. Coprophilia , also called gay hentai scatophilia or scat , is the paraphilia involving sexual arousal and pleasure from feces. HIV is among the infections that require such direct contact and is therefore very unlikely to be transmitted via mammary intercourse. Cartoon pornography is the portrayal of illustrated or animated fictional characters in erotic or sexual situations. Diaper fetishism, nappy fetishism or diaperism, is a sexual fetish in which a person feels a desire to wear or use diapers. People may experience pleasure from anal sex by stimulation of the anal nerve endings, and orgasm may be achieved through anal penetration – by indirect stimulation of the prostate in men, videos porno gay indirect clitoral/G-spot stimulation in women, and associated sensory nerves . 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 POV porn, the shooting style is generally similar to gonzo pornography, with the person receiving sexual gratification holding the camera him or herself—aiming it down at the actress or actor who is performing the sex act. Voyeur pornography may also include shots of topless women on topless beaches who are unaware of the cameras but may legally be photographed due to the public setting. A scene where many women have sex with one man is referred to as a reverse momporn gang-bang. The introduction of the home video and Internet saw a boom in the worldwide porn industry that generates billions of dollars annually. If one person is penetrated by two objects, it is generically called double penetration . The actual height of the giantess within the fantasy may vary depending on the individual. A person may be sexually penetrated multiple times simultaneously.