The glans itself may widen and lengthen as the stimulation continues, becoming slightly darker in colour, while the gliding action of the foreskin reduces friction. Works in this gaysex genre may explore philosophical, political or social issues. Cartoon pornography includes, but is not limited to, hentai and parody renditions of famous cartoons and comics. For a foot fetishist, points of attraction include the shape and size of the foot and toes , jewelry , treatments , state of dress , odor, and sensory interaction . Biological anthropologist Helen B. Ass to mouth is a slang term primarily used to describe the withdrawal of a penis from the receptive partner anus followed by the immediate insertion into the receptive partner mouth. Hermaphrodite, also known as herm, refers to pornography, typically hentai, that features persons with the genitalia of both sexes. 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, momsex as well as couples more commonly making their own tapes due lesbian hentai to the prevalence of video cameras. Group sex also occurs in populations of non-human animals such as bonobo apes and chimpanzees. Such video tapes are often released without the consent of their subjects, and could potentially damage celebrities careers. In some creampie films, both gay and straight, intercourse and internal ejaculation are followed by performers licking up the semen that has dripped from their bodies. In contrast, a celebrity may take the route of openly releasing the tape and benefit directly from royalties as well as indirectly from the publicity. To avoid soreness from this resulting friction, some may prefer to use a personal lubricant, masturbation cream or saliva during masturbation. The term has also applied to other professions and even companies trying to appeal to a gay demographic. In recent years, however, many celebrities have benefited from the publicity resulting from the release of a sex tape.