Mutual masturbation, mutual manual stimulation of the genitals between partners, can be a substitute for sexual penetration. The name was coined from the title momsex of the controversial book. This type of pornography is almost exclusively hentai, as true hermaphroditic humans are not fertile and are not usually found in nature. Some men also enjoy anal stimulation, with fingers or otherwise, without any prostate stimulation. Typically featured are hitting, choking, name-calling and hair-pulling. Transgender pornography features performers who cross-dress for sexual gratification, either for themselves or for their partners. In 1988, a sex tape caused significant damage to Rob Lowe career. The cover can have hinges or be a separate part. The phrase buttered bun is sometimes used to refer to the owner of the orifice in question. Mammary intercourse is known as titty-fucking, titfuck, or a titjob in the United States, as well as tit wank or French fuck in the United Kingdom - the latter term dating back to the 1930s; while a more jocular equivalent is a trip down mammary lane. John Stagliano is considered to have started the gonzo hentai videos pornography genre with his Buttman series of films. Hardcore pornography is pornography that depicts penetration or extreme fetish acts, or both. Throughout history, women have not had the same freedom or independence to pursue homosexual relationships as men, but neither have they met the same harsh punishment as homosexual men in some societies. Although there may be no connection between coprophilia and sadomasochism , the limited data on the former comes from studies of the latter. If one person is penetrated by two objects, it is generically called double penetration . Some straight actors have started acting in gay porn only to be accused gay twinks of being gay while others first step was to strictly do solo scenes. Pornography may fall into more than one genre. The reverse of this, in which nude women interact with clothed men, is called Clothed male, naked female .
