The porn industry and viewing public were shocked by the then-taboo spectacle of a white woman having sex with a black man. Foot fetish pornography features heavy emphasis on the feet of the participants, either in combination with kissing and genital sex or in the context of acts such as trampling or crush fetishism. Evolutionary psychologists suggest that rounded buttocks may have evolved to be desirable trait because they provide a visual indication of the woman youth and fertility. Hamedori is a genre of Japanese pornography in which a male adult video actor or director serves as the camera operator. Many fantasies include the macrophile shrinking before a normal sized woman or keeping his or her normal height while the partner grows in size. Because the viewing of such films carried a social stigma, they were viewed at brothels, adult movie theaters, stag parties, at home, in private clubs and also at night cinemas. For circumcised males, on whom the glans is mostly or completely uncovered, gay cock this technique creates more direct contact between the hand and the glans. Animal masturbation has been observed in many species, both in the wild and in captivity. In Japanese, this natural-fibre rope is known as asanawa; the Japanese vocabulary does not make a distinction between hemp and jute. Femdom features BDSM scenes in which the dominant partner is female. Double penetration of the vagina, anus and mouth, can involve: Simultaneous penetration of the anus by two gay hentai penises or other objects. 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. Group sex most commonly takes place in a private sex party or semi-public swinger gathering, but may also take place at massage parlors or brothels or, in some jurisdictions, at purpose-built locations such as sex clubs. Entacle erotica describes a type of pornography most commonly found in Japan which integrates horny milfs traditional pornography with elements of bestiality and a fantasy, horror, or science-fiction theme.