A few extremely flexible males can reach and stimulate their penis with their tongue or lips, and so perform autofellatio. It is sometimes described as a sexual fantasy, by women or men, depicting an exhibitionist or physique worship scenario. Examples include the Girls Gone Wild and Girls Who Like Girls Series. Cuckold fetish pornography that involves a cuckolded husband. First found in softcore movies and erotic thrillers, depictions of lesbianism entered mainstream cinema in the 1980s. A crush fetish is a fetish in which one is sexually aroused usually when someone crushes objects, food, and sometimes small animals with their body, usually under their foot, or when crushed oneself. Ass to mouth pornography shows the transfer hentai porn of a performer penis from a second performer anus to that same second performer mouth in a single shot. Snuff pornography involves the actual death of any of the participants, consenting or otherwise, simulated big tit milf death is not considered snuff. Shibari is a Japanese word that literally means to tie or to bind. The stigma of being gay or labeled as such has steadily eroded since the Stonewall riots began the modern American gay rights movement in 1969. BDSM is a variety of erotic practices involving dominance and submission, role-playing, restraint, and other interpersonal dynamics. In some scenes or relationships it may be impossible for consent to be withdrawn in the middle of a scene, or the bottom may have the ability to revoke consent for a relationship as a whole, but not for a particular scene. Mammary intercourse is said by Alex Comfort to produce mutual orgasm in women with sensitive breasts , and it was one of the nine substitute exercises for penetrative sexual activities, as detailed in the Paradis Charnels of 1903. There has been an increase in discussion and portrayal of masturbation in art, popular music, gay boy porn television, films, and literature. Several hundred exclusively pegging films were produced, as well as twice as many bisexual and straight films with strap-on scenes.