In the fetish cuckolding subculture, it is most common for the female to take on the sexually dominant role and the male the submissive role, however, female subs, sometimes referred to as cuckqueans, also exist. 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. A few extremely flexible males can reach and stimulate their penis with their tongue or lips, and so perform autofellatio. Gloryhole pornography features women performing fellatio on unidentified men through a small hole made in a bathroom divider. Sexologist Alfred Kind suggested that the buttocks is the primary sexual presentation site in primates. Animal masturbation has been observed in many species, both in the wild and in captivity. Related genres include: Amateur pornography originally referred only to pornography produced by amateurs but now also includes professionally big tit milf made pornography designed to appear as if it were amateur. There has been an increase in discussion and portrayal of masturbation in art, popular music, television, films, and literature. Facial cum shots are currently regularly portrayed in pornographic films and videos, often as a way to close a scene. Women that take on the roles of the giantess within this fetish often find the practice to be empowering and enjoy being worshiped. Other objects such as ball point pens and thermometers are sometimes used, although this practice can lead to injury and/or infection. The term combines elements of the Freudian psychoanalytic fetish and the Marxist commodity fetish, and is used in the context of British, Spanish and French colonialism and imperialism and their aftereffects. Softcore gay pornography also exists; it at one time constituted the genre, and may be produced as beefcake gay hentai pornography for heterosexual female and homosexual male consumption. Bisexual pornography gay bear porn is a genre of pornography which most typically depicts one woman and two men who all perform sex acts on each other.