Bondage pornography specializes in the depiction of sexual bondage or BDSM activities as photographs, stories, movies, or drawings. 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. Common phrases used to refer to these individuals are chicks with dicks or the derogatory term shemale, although these are generally considered pejorative among transwomen. Tentacle erotica can be consensual, but frequently contains elements of non-consensual sex. Transgender pornography features performers who cross-dress for sexual gratification, either for themselves or for their partners. Often, strong views are expressed with regard to anal sex; it is controversial in various cultures, especially with regard to religion, commonly due to prohibitions against anal sex among gay men or teachings about the procreative purpose of sexual activity. Men may also rub or massage the glans, the rim of the glans, and the frenular delta. 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. Dwarfs or midget pornography features performers who are dwarfs/midgets. For example, in Australia it 3d hentai is rated mobile porn sites Refused Classification mature milfs naked celebrities . The concept of lesbian, videos porno gay to differentiate women with a shared sexual orientation, is a 20th-century construct. Other objects such as ball point pens and thermometers are sometimes used, although this practice can lead to injury and/or infection. Rape pornography features gay movie performers simulating rape. What seems clear from the historical record is that much of the lesbian material in pornographic texts was intended for a male readership. Older names for a pornographic film include stag film, and blue movie.