Bestiality pornography involves the sexual attraction of humans to animals. It may involve sexual attraction to women who are pregnant or appear pregnant, attraction to lactation, or attraction to particular stages of pregnancy such as impregnation or childbirth. Other forms of anal sex include fingering, the use of sex toys for anal penetration, oral sex performed on the anus , and pegging. Common phrases used to refer to these individuals are chicks with dicks, trannies, or shemales, although these are generally considered pejorative slurs among transwomen. The effect is to give the viewer the sense that they are experiencing the sex acts that they are watching, as opposed to simply watching others as a voyeur. Some actors who are actually gay or bisexual will be marketed as straight to appeal to the allure of the unattainable, because straight men are virgins to sex with other men, and as in most gay male settings, the young, the muscular, anime hentai and the unfamiliar are more sought.. Since at least 1973, it has also been used to refer to a gay movies sexually attractive young woman. Though the term anal sex most commonly means penile-anal penetration, sources sometimes use the term anal intercourse to refer exclusively to penile-anal penetration, and anal sex to refer to any form of anal sexual activity, especially between pairings as opposed to anal masturbation. The term is a slang word that originated in the gay community and comes from the equestrian term bareback, which refers to the practice of riding a horse without a saddle. The related term twinkle-toes, which implies that a man is effeminate, tends to be used in a derogatory manner. Sub-genres of Japanese porn Among the various sub-genres of Japanese pornography are the following: Lolicon ロリコン: This genre involves prepubescent and adolescent girls between the aged of 6-12. In some societies, the terms mature milfs fox, plum, chick, or chicken are preferred. The surfacing of sex tapes has become so common that some are leaked as a marketing tool to advance or establish a media career.