Following the introduction of the Motion Picture Association of America film rating system, independent animation producers attempted to establish an alternative to mainstream animation. However, mature milfs various groups within society considered such depictions immoral, labelling them pornographic, and attempting to have them suppressed under obscenity laws, with varying degrees of success. Some may keep their hand stationary while pumping into it with pelvic thrusts in order to simulate the motions of sexual intercourse. Cuckolding can also be mixed with other non-monogamous relationship arrangements with which it has substantial overlap such as Swinging, wife-swapping, open relationships, and polyamory, etc. Works in this genre may be considered adult for any number of reasons. Hermaphrodite, also known as herm, refers to pornography, typically hentai, that features persons with the genitalia of both sexes. On the other hand, the masochist enjoys being hurt, humiliated, or suffering within the consensual scenario. Double Stuffed , Double Vaginal , or Double gay cock Anal pornography involves the penetration of one orifice by two penises or other objects. For example, in Australia it is rated Refused Classification . The phrase buttered bun is sometimes used to refer to the owner of the orifice in question. In Japanese, this natural-fibre rope is known as asanawa; the Japanese vocabulary does not make a distinction between hemp and jute. If one person is penetrated by two objects, it is generically called double penetration . Its primary goal is sexual arousal in its audience. In Canada, Teletoon offers hentai videos up its own Teletoon at Night programming block. Mutual masturbation, mutual manual stimulation of the genitals between partners, can be a substitute for sexual penetration. This genre also features male-on-male fellatio through a small hole made in a bathroom divider. Snowballing or snowdropping is the human sexual practice in which one person takes someone else semen into his or her mouth and then passes it to the mouth of the other, usually through kissing.