Dwarfs or midget pornography features performers lesbian hentai who are dwarfs/midgets. It is sometimes combined with BDSM features. As of 2013, little analysis of this paraphilia has been reported in medical literature. Normal quantities of ejaculate range from 1.5 to 5.0 milliliters . The person receiving anilingus is regarded as the passive partner in the act, and the person performing anilingus is the active partner. It has also been recommended as a form of foreplay or safer sex. Some do not use the diapers at all, for arousal, or bladder and bowel movements. The term soft crush refers to the more common fetish surrounding videos involving inanimate objects or small invertebrates being crushed, while the term hard crush refers to such videos involving larger animals with vertabrae, and arguably more pain-susceptible animals . Transsexual porn star Wendy Williams has stated that transsexual porn is classified as Straight Specialty. Reflective of its views on sexuality and culture, Japanese pornography delves into a wide spectrum of heterosexual, homosexual, and transgender sexual acts in addition to unique fetishes and philias. English adopts and uses hentai as a genre of pornography by the commercial sale and marketing of explicit works under this label. Men may find stimulation of the anus, gay twink porn rectum, and adjacent organs enjoyable. If this is done using penises and/or strap-on dildos, this is sometimes called the sandwich or BigMac. The term Asiaphile is sometimes used to describe the same phenomenon as is yellow fever . Emetophilia pornography involving vomiting and gagging. BDSM is a variety of erotic practices involving dominance and submission, role-playing, restraint, and other interpersonal dynamics. Actual spying may violate privacy and/or trespassing laws in many countries. Pegging is a sexual practice in which a woman performs anal sex on a man by penetrating the man anus with a strap-on dildo. Gloryhole pornography features women performing fellatio on unidentified men through a small hole made in a bathroom divider.