The term BDSM dates back to 1969; however, the origin of the term BDSM is unclear and is believed to have been formed either from joining the term B&D with S&M , or as a compound initialism from B&D, D&S , and S&M. It has since become popular enough with couples to be discussed during an episode of Sex and the City. The name was coined from the title of the controversial book. The strategies and tactics that are used to smuggle lesbian milfs one of the couple into and out of the toilet undetected are celebrity porn as important or almost as important as the urination. A celebrity can fight the release in court to maintain deniability while still enjoying the career benefits. Although there may be no connection between coprophilia and sadomasochism , the limited data on the former comes from studies of the latter. Mutual masturbation, mutual manual stimulation of the genitals between partners, can be a substitute for sexual penetration. Masturbation is the self-sexual stimulation of the genitals for sexual arousal or other sexual pleasure, usually to the point of orgasm. Content featuring male bisexuality has been a growing trend since the advent of internet pornography. 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. Particular areas and processes of the body that change during pregnancy may also become the focus of psychological investment, but nudity or sexual activity is not always essential, and in some cases actual pregnancy is not necessary to invoke arousal. Such ejaculation can be done by mammary intercourse, or masturbation over the other gaysex person, or result from the withdrawal of the penis from a partner mouth as he is ejaculating following anime hentai fellatio, irrumatio, or intercourse. In Japan, point of view naked celebrities pornography is referred to as hamedori . A 2009 study found that heterosexual male fat admirers preferred females that were clinically overweight and rated both overweight and obese women more positively than slighter individuals.