Lolicon and its contribution to the controversy regarding the regulation of pornography of depicting minors that don’t exist has been a major issue for free speech in and outside of Japan. Individuals are also sometimes abbreviated when referred to in writing, so a dominant person may be referred to as a Dom for a man, and a Domme for a woman. Sexologist Alfred Kind suggested that the buttocks is the primary sexual presentation site in primates. The full-weight body-pressure, moisture, sex odors and darkness can be perceived as powerful sexual attractions or compulsions. 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. Entacle erotica describes a type of pornography most commonly found in Japan which integrates traditional pornography with elements of bestiality and a fantasy, horror, or science-fiction theme. Often, strong views are expressed with regard to anal sex; it is controversial in various cultures, especially with regard to religion, commonly due to prohibitions against anal sex among gay men or teachings about the procreative purpose of sexual activity. Kinbaku means tight binding Kinbaku-bi which literally means the beauty of tight binding. The arousal from being desperate comes from the sensation of having a full bladder. Bondage/BDSM Bondage pornography features performers tied up or constrained in various ways. Dwarfs or midget pornography features performers who are dwarfs/midgets. Cuckold fetish pornography that involves a cuckolded porn milf husband. Jerk off instruction features a performer encouraging or instructing gay movies the viewer to masturbate, often culminating in a countdown at the end of which the viewer is invited to induce orgasm. As of 2013, little analysis of this paraphilia has been reported in medical literature. A crush fetish is a fetish in which one is sexually aroused usually when someone crushes objects, food, and sometimes small hentai sex animals with their body, usually under their foot, or when crushed oneself.