Some prefer a particular type of clothing to urinate. Most bisexual porn is made by small production companies horny milfs rather than the major studios. In Japan, point of view pornography is referred to as hamedori . A woman can use a secondary vibrator, between the dildo and her genitals, to get pleasure from pegging. People may experience pleasure from anal sex by stimulation of the anal nerve endings, and orgasm may be achieved through anal penetration – by indirect stimulation of the prostate in men, indirect clitoral/G-spot stimulation in women, and associated sensory nerves . Some people masturbate by using machines that simulate intercourse. If one person is penetrated by two objects, it is generically called double penetration . The Girls Gone Wild series gaysex is one example. Lolita pornography caters to ephebophiles. The term BDSM dates back to 1969; however, the lesbian hentai 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. Certain websites have begun providing bondage videos and photographs featuring the kidnapping roleplay, which has been largely the hallmark of detective style bondage magazines. The activity is done by itself or as a part of or prelude to other activities which many times involve sex. Sadism describes sexual pleasure derived by inflicting pain, degradation, humiliation on another person or causing another person to suffer. In these research publications, it is suggested that real female ejaculation is the release of a very scanty, thick, and whitish fluid from the female prostate, while the squirting or gushing shown frequently in pornography is a different phenomenon, the expulsion of clear and abundant fluid, which has been shown to be a diluted fluid from the urinary bladder. However, gay pornography in the modern world is mostly concentrated in the making of home videos , cable broadcast and emerging video on demand and wireless markets, as well as images and movies for viewing on the Internet.