Since the 1980s, many practitioners and organizations have adopted the motto safe, sane and consensual, commonly abbreviated as SSC, which means that everything is based on safe activities, that all participants be of sufficiently sound/sane mind to consent, and that all participants do consent. Both forms of pornography generally contains nudity. The first explicit pegging scene is believed to have been in the 1975 pornographic film The Opening of Misty Beethoven. Commercialized pornography accounts for a nearly US0 billion worldwide industry for the production of various media and associated products and services. In the fetish cuckolding subculture, it is most common for the female to take on the sexually dominant role and the male the submissive role, however, female subs, sometimes referred to as cuckqueans, also exist. Celebrity sex tapes are amateur or professionally-made recordings of sex acts, as performed by a celebrity and their partner. Older names for a pornographic film include stag film, and blue movie. Pegging is a sexual practice in which a woman horny milfs performs anal sex on a man by penetrating the man anus with a strap-on dildo. Female ejaculation is the expulsion of fluid hot gay sex by the paraurethral ducts through and around the human female urethra during or before an orgasm. The concept of lesbian, to differentiate women with a shared sexual orientation, is a 20th-century construct. As of 2013, little analysis of this paraphilia has been reported in medical literature. Some may keep their hand stationary while pumping into it with pelvic thrusts in order to simulate the motions of sexual intercourse. A pornographic work is characterized as hardcore if it has any hardcore content, no matter how small. Stimulating the prostate from outside, via pressure on the perineum, can be pleasurable as well. Shibari is a Japanese word that literally means hentai movies to tie or to bind. Pornography in Japan is large and intertwined business of adult entertainment with unique characteristics that readily distinguish it from western pornography.