See Gay-for-pay. It is sometimes described as a sexual fantasy, by women or men, depicting an exhibitionist or physique worship scenario. As of 2013, little analysis of this paraphilia has been reported in medical literature. 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. Examples include the Girls Gone Wild and Girls Who Like Girls Series. Related genres include: Amateur pornography originally referred only to pornography produced by amateurs big tit milf but now also includes professionally made pornography designed to appear as if it were amateur. Watersports pornography features sexual activities involving 3d hentai urine, such as golden showers. However, the tradition of bondage magazines continues in the form of art books of bondage photographs, published by mainstream publishers such as Taschen. The term hentai is never used in this context in Japanese. Currently, animated television series aimed at adults are some of the most popular and critically acclaimed forms of entertainment. Lesbian pornography made for women is usually made by women, and usually features women who identify as lesbian or bisexual. As a result, little in history was documented to give an accurate description of how female homosexuality is expressed. English adopts and uses hentai as a genre of pornography by the commercial sale and marketing of explicit works under this label. Originating in Japan in the 1980s, the genre subsequently spread to North America and Europe, and crossed over into gay pornography. Usually that person prefers to stage the wetting so that his/her legs become soaked with urine. Guro or Gore is a genre of Japanese pornography gay cock involving blood, gore, disfiguration, violence, mutilation, urine, enemas, or feces. A male voyeur is commonly labeled Peeping Tom, a term which originates from the Lady Godiva legend.