Macrophilia is a fascination big tit milf with or a sexual fantasy involving giants, more commonly expressed as giantesses . 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 gay hentai black and white performers. Entacle erotica describes a type of pornography most commonly found in Japan which integrates traditional pornography with elements of bestiality and a fantasy, horror, or science-fiction theme. For instance, Amateur Allure has a trademark videos porno gay shot where the sexually performing cameraman circles a handycam around the sexually performing model head. Women who perform in lesbian pornography often do not consider themselves lesbian or bisexual. It is used, for example, at fertility clinics to stimulate sperm donors. Transsexual pornography is a genre of pornography. Since mammary intercourse is a non-penetrative sex act, the risk of passing a sexually transmitted infection that requires direct contact between the mucous membranes and pre-ejaculate or semen is greatly reduced. A sex party is a gathering at which sexual activity takes place. Other objects such as ball point pens and thermometers are sometimes used, although this practice can lead to injury and/or infection. In human sexuality, a threesome is sexual activity that involves three people at the same time. 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. The scenario is a genre of erotica, which on the internet is sometimes abbreviated to CMNF, and may involve sexual and nonsexual erotic scenarios. Bondage websites and bondage imagery in mainstream pornography As of 2003, specialist bondage magazines were mostly displaced by the availability of bondage material on the World Wide Web, and the presence of bondage imagery in mainstream pornographic magazines such as Nugget and Hustler Taboo magazine.