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. Now facial cumshots are regularly portrayed in pornographic films, videos, magazines and internet web sites. For uncircumcised males, stimulation of the penis in this way comes from the pumping of the foreskin, in which the foreskin is held and slid up and down over the glans, which depending on foreskin length, is completely or partially covered and then uncovered in a rapid motion. 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 gay twinks antiquity, if not to prehistory. The term Asiaphile is sometimes used to describe hentai sex the same phenomenon as is yellow fever . First found in softcore movies and erotic thrillers, depictions of lesbianism entered mainstream cinema in the 1980s. In some societies, the terms fox, plum, chick, or chicken are preferred. Bara male homosexual hentai designed to appeal to men. Sexologist Alfred Kind suggested that the buttocks milf fuck is the primary sexual presentation site in primates. The concept of lesbian, to differentiate women with a shared sexual orientation, is a 20th-century construct. Heterosexual bareback sex, as opposed to sex with condoms, not only poses an increased risk of STIs, but for pregnancy as well. Sex parties may be organized to enable people to engage in casual sexual activity or for swinging couples or people interested in group sex to meet, but any gathering where sexual activity is anticipated can be called a sex party. Omorashi: The act of holding one own urine until the need to urinate is urgent, making another hold in their urine, or watching another person with an urgent need to urinate. The term hentai is never used in this context in Japanese. 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.