Solo pornography recognized with AVN Awards include the All Alone series and All Natural: Glamour Solos. The name was coined from the title of the controversial book. Lying face down on a comfortable surface such as a mattress or pillow, the penis can be lesbian milfs rubbed against it. When the interest in a particular subject is obsessive, the behavior may be described as stalking. Pornography may hentai sex fall into more than one genre. Diaper fetishism is totally independent from pedophilia as the wearer derives pleasure only from the diaper and/or use of it. Men may also rub or massage the glans, the rim of the glans, and the frenular delta. Biological anthropologist Helen B. Detective magazines, comic books and early fetish magazines In the early 20th century, Detective magazines covertly provided a way of publishing bondage imagery. Buttocks are sometimes emphasized in pornography, where they are often referred to as booty. Solo performances in gay pornography have been described in 1985 as either or both active and/or passive , whereas female solo performances are said to be exclusively passive . By comparison, gonzo pornography puts the camera right into the action, often with one or more of the participants both filming and performing sexual acts, without the usual separation between camera and performers seen in conventional porn and cinema. These are often fake. Older names for a pornographic film include gay cock stag film, and blue movie. Following World War II, during a period of social repression when governments actively persecuted homosexuals, women developed networks to socialize with and educate each other. The warm sensation felt when urine trickles on the body seems to give very relaxing and pleasurable feelings to the person. The activity is done by itself or as a part of or prelude to other activities which many times involve sex. Group sex most commonly takes place in a private sex party or semi-public swinger gathering, but may also take place at massage parlors or brothels or, in some jurisdictions, at purpose-built locations such as sex clubs.