Following the introduction of hentai porn the Motion Picture Association of America film rating system, independent animation producers attempted to establish an alternative to mainstream animation. It is the most common form of sexual fetishism for otherwise non-sexual objects or body parts. These are often fake. Such grounds and even the definition of pornography have differed in various historical, cultural, and national contexts. Low et al. The consensual submission of the submissive is sometimes demonstrated to others by symbols indicating his/her belonging to the dominant, such as wearing a collar, special tattoos, piercings, a very videos gays short haircut or a bald head. Pantyhose/Tights/Stockings pornography involves women or men dressed in pantyhose, tights, or stockings. However, gay pornography in the modern world is mostly concentrated in the making of home videos , cable broadcast and emerging video on demand and wireless markets, as well as images and movies for viewing on the Internet. 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. Creampie pornography features ejaculation inside the vagina , mouth or rectum instead of the common cum shot, followed by the visible seeping or dripping of semen lesbian milfs from the vagina, mouth or anus. Special forms include erotic roleplay like ageplay, in which a difference in age, either real or enacted, formulates the background; or petplay. The most successful animated features produced in the United States primarily for adult audiences were directed by Ralph Bakshi, including Fritz the Cat, Heavy Traffic and Coonskin. Threesome or 3some pornography features one man and two women . Today, pornographic films can be sold or rented on DVD, shown through Internet and special channels and pay-per-view on cable and satellite, and in adult theaters.