Bukkake pornography involves a performer, usually female, onto whom several men or women ejaculate, usually on the face. Some pornographic films use an artificial semen substitute to simulate or enhance creampie shots. In Japanese, the term describes any type of perverse or bizarre sexual desire or act; it does not represent a genre of work. These styles are much closer to the style of bondage scenes in mainstream television. Yaoi is anime or manga that features gay males . The warm sensation felt when urine trickles on the body seems to give very relaxing and pleasurable feelings to the person. Threesome or 3some pornography features one man and two women . A related term used gay twinks in the genre is the term cougar, which implies an older woman as predator. In Japan, point of view pornography hentai movies is referred to as hamedori . Following the introduction of the Motion Picture Association of America film rating system, independent animation producers attempted to establish an alternative to mainstream animation. The current public acceptance of celebrities with sex tapes is speculated by Joe Levy, executive editor of Rolling Stone, to be due to the easy availability of pornography, as well as couples more commonly making their own tapes due to the prevalence of video cameras. The term has also applied to other professions and even companies trying to appeal to a gay demographic. See also Gay-for-pay. The Girls Gone Wild series is one example. Andrews cross or spreader bars. Lesbian pornography typically features a wider range of appearances and body types than is typical of mainstream pornography. Those with diaper-related paraphilias differ widely in their focus of attention. Since mammary intercourse is a non-penetrative sex act, the risk of passing a sexually transmitted infection that requires direct contact between the mucous membranes and pre-ejaculate or semen lesbian milfs is greatly reduced. Works in this genre may be considered adult for any number of reasons. Lolita pornography caters to ephebophiles.