Although interracial pornography theoretically can apply to depictions of sexual activity between performers of any different racial groups, the term is most commonly used for heterosexual sex acts between black and white performers. Specific sex acts Anal Anal pornography features anal penetration with a penis, dildo, other objects, or some combination of them. The range of its individual characteristics is thereby wide. Terminology for roles varies widely within the various BDSM subcultures. Transsexual pornography is a genre of pornography. Incest itself is largely taboo, and is a crime in many countries. The name was coined from the title of the controversial anime hentai book. Commenting on why there are not as many female macrophiles, psychologist Helen Friedman theorized that because women in most societies already view men as dominant and powerful, there no need for them to fantasize about it. A few extremely flexible males can reach and stimulate their penis with their tongue or lips, and so perform autofellatio. Double penetration lesbian milfs of the vagina, anus and mouth, can involve: Simultaneous penetration of the anus by two penises or other objects. In human sexuality, a threesome gay bear porn is sexual activity that involves three people at the same time. Multiple men and women Bisexual pornography features one woman and two men who all perform sex acts on each other. Voyeur pornography may also include shots of topless women on topless beaches who are unaware of the cameras but may legally be photographed due to the public setting. The first explicit pegging scene is believed to have been in the 1975 pornographic film The Opening of Misty Beethoven. The concept of lesbian, to differentiate women with a shared sexual orientation, is a 20th-century construct. There are number of types of sex parties: Swinger party/gathering A swinger party or partner-swapping party is a gathering at which individuals or couples in a committed relationship can engage in sexual activities with others as a recreational or social activity.