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. Actual upskirt or downblouse shots may violate gay twink porn privacy laws in some countries. A sub-set of vaginal fisting attempts to photograph the female cervix immediately after the fist is removed from the now-gaping vagina. A pearl necklace is a slang term referring to a sexual act in which a man ejaculates semen on or near the neck, chest, or breast of another person. Shemale is a term primarily used in sex work to describe a trans woman with male genitalia combined with female secondary sex characteristics, usually including augmented female breasts, from breast augmentation and/or use of hormones. This can, however, redirect semen into the bladder . Homi Bhabha defined the idea of a racial fetish in contrast to the idea of the Freudian sexual fetish which he describes a denial of difference, where the male sees the female as a castrated male, seeing missing parts rather than a different anatomy. BDSM is a variety of erotic practices involving dominance and submission, role-playing, restraint, and other interpersonal dynamics. Watersports pornography features sexual activities involving urine, such as golden showers. English adopts and uses hentai as a genre of pornography by the commercial sale and marketing of explicit works under this label. People may engage in hentai movies anilingus for its own sake, before anal fingering or penetration, or as part of foreplay. Dwarfs milf xxx or midget pornography features performers who are dwarfs/midgets. Snuff pornography involves the actual death of any of the participants, consenting or otherwise, simulated death is not considered snuff. A survey by the New York City Department of Health and Mental Hygiene found that heterosexual women are more likely to bareback when engaging in anal sex than homosexual and bisexual men. A variation on this is to place the fingers and thumb on the penis as if playing a flute, and then shuttle them back and forth.