In 1988, a sex tape caused significant naked milf damage to Rob Lowe career. A pornographic work is characterized as hardcore if it has any hardcore content, no matter how small. As of 2013, little analysis of this paraphilia has been reported in medical literature. For instance, Amateur Allure has a trademark shot where the sexually performing cameraman circles a handycam around the sexually performing model head. Sub-genres can also be classified into the characteristics of the performers or the type of sexual activity on which it concentrates, and not necessarily on the market to which each sub-genre appeals. In more vigorous forms of fisting, such as punching or punchfisting, a fully clenched fist may be inserted and withdrawn slowly. This stop and go build-up, known as edging, can achieve even stronger orgasms. The scenario is a genre of erotica, which on the internet is sometimes abbreviated to CMNF, and may involve sexual and nonsexual erotic scenarios. Participants who exert sexual control over their partners are known as dominants or tops while participants who take the passive, receiving, or obedient role are known as submissives or bottoms. Animal masturbation has been observed in many species, both in the wild and in captivity. Tentacle erotica can be consensual, but frequently gay sex video contains elements of non-consensual sex. There has been an increase in discussion and portrayal of masturbation in art, popular music, television, films, and literature. Solo performances in gay pornography have been described in 1985 as either or both active anime hentai and/or passive , whereas female solo performances are said to be exclusively passive . Individuals are also sometimes abbreviated when referred to in writing, so a dominant person may be referred to as a Dom for a man, and a Domme for a woman. 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.