Detective magazines, comic books and early fetish magazines In the early 20th century, Detective magazines covertly provided a way of publishing bondage imagery. Is also common of the furry genre. As of 2013, little analysis of this paraphilia has been reported in medical literature. In more vigorous forms of fisting, such as punching or punchfisting, a fully clenched fist may be inserted and withdrawn slowly. If this is done using penises and/or strap-on dildos, this is sometimes called the sandwich or BigMac. While anal sex is commonly associated with male homosexuality, research shows that not all gay males engage in anal sex and that it is not uncommon in heterosexual relationships. The reverse of this, in which nude women interact with clothed men, is called Clothed male, naked female . The object or situation of interest is called the fetish; the person who has a fetish for that object/situation is a fetishist. 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. This can, however, redirect semen into the bladder . Entacle erotica describes hot gay sex 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. Voyeurism: Seeing another urinate without the person knowledge either through video taping by a hidden camera, or by lurking in locations where people are urinating or are likely to have an urge to urinate. There has been an increase in discussion and portrayal of masturbation in art, popular music, television, films, and literature. A pornographic work is characterized as hardcore if it has any big tit milf hardcore content, no matter how small. There is, however, no third party camera work involved. Pro-am pornography is sub-genre of amateur pornography that refers to professionally made porn that features amateur actors/actresses, 3d hentai often appearing for the first time in a pornographic film.