Shibari is a Japanese word that literally means to tie or to bind. The prostate gland is one of the organs that contributes fluid to semen. A few extremely flexible males can reach and stimulate their penis with their tongue or lips, and so perform autofellatio. Especially popular in post-World War 2 Japanese culture. Comic books often featured gay movies characters being tied up and tying others up, particularly in damsel in distress plots. 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. Bottom and submissive are widely recognized terms for those partner in the relationship or activity who are, respectively, the physically receptive or controlled participants. Dwarfs milf xxx or midget pornography features performers who are dwarfs/midgets. Some do not use the diapers at all, for arousal, or bladder and bowel movements. Although pornography has usually focused on heterosexuality, due to the prevalence of the heterosexual orientation, explicit gay material has a long history as well, which reaches back to Greek antiquity, if not to prehistory. 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. Klaw ran an international mail-order business out of his store, Movie Star News, selling cheesecake pinups and bondage/spanking photos. In addition to mainstream pornography, the popularity of facials has led to creation of its own niche market, like video series that specialize in showing the act. Normal quantities of ejaculate range from 1.5 to 5.0 milliliters . English adopts and uses hentai as a genre of pornography by the commercial sale and marketing of explicit works under this label. Tentacle rape or shokushu goukan is found in some horror or hentai titles, with tentacled creatures having sexual intercourse with female characters. Gay-for-pay describes male or female actors, pornographic stars, or sex workers who self-identify as heterosexual but who are paid to act or perform as 3d hentai homosexual professionally.