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. For much of the history of cinema and television, lesbianism was considered taboo, though since the 1960s it has increasingly become a genre in its own right. The range of its individual characteristics is thereby wide. Many fantasies include the macrophile shrinking before a normal sized woman or keeping his or her normal height while the partner grows in size. For some people, non-penetrative sex is the primary sexual activity of choice above all others. Commercialized pornography accounts for a nearly US0 billion worldwide industry for the production of various media and associated products and services. Solo performances in gay pornography have been described in 1985 as either or both active and/or passive milf fuck , whereas female solo performances are said to be exclusively passive . The Silent Duck, also called Duck-Billing, is the technique often used in which the person engaging in hand insertion shapes the hand to resemble a duck beak. Pornography may be presented in a variety of media, including books, magazines, postcards, lesbian hentai photographs, sculpture, drawing, painting, animation, sound recording, film, video, and video games. The gay twinks concept of lesbian, to differentiate women with a shared sexual orientation, is a 20th-century construct. Sometimes one or more fingers may be inserted into the vagina to stroke its frontal wall where the G-spot may be located. Foot fetishism has been defined as a pronounced sexual interest in the feet or footwear. Hamedori is a genre of Japanese pornography in which a male adult video actor or director serves as the camera operator. Femdom features BDSM scenes in which the dominant partner is female. Female ejaculation is the expulsion of fluid by the paraurethral ducts through and around the human female urethra during or before an orgasm.