Some pornographic films use an artificial semen substitute to simulate or enhance creampie shots. Diaper hentai videos fetishism is totally independent from pedophilia as the wearer derives pleasure only from the diaper and/or use of it. They may regard it as an enhancing element of their sex lives or as their primary form of sexual activity. Urolagnia young gay porn is a form of salirophilia in which sexual excitement is associated with the sight or thought of urine or urination. In Japanese, the term describes any type of perverse or bizarre sexual desire or act; it does not represent a genre of work. The term pearl necklace is used by some because the drops of semen deposited by the man resemble a necklace of translucent white pearls. For example, in Australia it is rated Refused Classification . The cover can have hinges or be a separate part. Pornographic films are typically categorized as either softcore or hardcore pornography. When used as an alternative to penile-vaginal penetration, the goal may be to preserve virginity or to prevent pregnancy. Testosterone discourages fat storage in these areas. Behind the Green Door was one of the first pornographic films to feature sex between a white actress with a black actor . Patricia Hill Collins, an African-American writer, theorizes that this is derived from a stereotype that those of black descent are promiscuous, and their buttocks are objectified by porn as a result. Women big tit milf oriented pornography is sometimes referred to as sex positive pornography. Arcane or occult pornography involves sexualized situations with an occult or magical tone or performers who costume themselves in keeping with the theme, for example, a male performer dressed as a wizard. For some people, non-penetrative sex is the primary sexual activity of choice above all others. Detective magazines, comic books and early fetish magazines In the early 20th century, Detective magazines covertly provided a way of publishing bondage imagery. Shotacon : Similar to Lolicon, this genre involves prepubescent or under-aged boys between the ages 6–12.