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Pornography (often abbreviated as "porn" or "porno" in informal usage) is the portrayal of sexual subject matter for the purpose of sexual arousal. Pornography may be presented in a variety of media, including books, magazines, postcards, photographs, sculpture, drawing, painting, animation, sound recording, film, video, and video games. The term applies to the depiction of the act rather than the act itself, and so does not include live exhibitions like sex shows and striptease. The primary subjects of pornographic depictions are pornographic models, who pose for still photographs, and pornographic actors or porn stars, who perform in pornographic films. If dramatic skills are not involved, a performer in a porn film may also be called a model. Various groups within society have considered depictions of a sexual nature immoral and noxious, labeling them pornographic, and attempting to have them suppressed under obscenity and other laws, with varying degrees of success. Such works have also often been subject to censorship and other legal restraints to publication, display or possession. Such grounds and even the definition of pornography have differed in various historical, cultural, and national contexts.〔H. Mongomery Hyde (1964) ''A History of Pornography'': 1–26.〕 Social attitudes towards the discussion and presentation of sexuality have become more tolerant and legal definitions of obscenity have become more limited, leading to an industry for the production and consumption of pornography in the latter half of the 20th century. The introduction of home video and the Internet saw a boom in the worldwide porn industry that generates billions of dollars annually. Commercialized pornography accounts for over US$2.5 billion in the United States alone,〔 including the production of various media and associated products and services. This industry employs thousands of performers along with support and production staff. It is also followed by dedicated and trade groups as well as the mainstream press, private organizations (watchdog groups), government agencies, and political organizations. More recently, sites such as Pornhub, RedTube and YouPorn, have served as repositories for home-made or semi-professional pornography, made available free by its creators (who could be called exhibitionists). It has presented a significant challenge to the commercial pornographic film industry. Irrespective of the legal or social view of pornography, it has been used in a number of contexts. It is used, for example, at fertility clinics to stimulate sperm donors. Some couples use pornography at times for variety and to create a sexual interest or as part of foreplay. There is also some evidence that pornography can be used to treat voyeurism. ==Etymology== The word is similar to the modern Greek πορνογραφία (''pornographia''), which derives from the Greek words πόρνη (''pornē'' "prostitute" and πορνεία ''porneia'' "prostitution"〔(List of Greek words starting with πορν- (''porn-'') ) on Perseus.〕), and γράφειν (''graphein'' "to write or to record", derived meaning "illustration", cf. "graph"), and the suffix -ία (''-ia'', meaning "state of", "property of", or "place of"), thus meaning "a written description or illustration of prostitutes or prostitution". No date is known for the first use of the word in Greek; the earliest attested, most related word one could find in Greek, is , ''pornographos'', i.e. "someone writing of harlots", in the ''Deipnosophists'' of Athenaeus.〔.〕〔 At the Perseus Project.〕 "Pornographie" was in use in the French language during the 1800s. The word did not enter the English language as the familiar word until 1857〔(Online Etymology Dictionary ). Etymonline.com. Retrieved on 2011-04-21.〕 or as a French import in New Orleans in 1842.〔(history of the word pornography | podictionary – for word lovers – dictionary etymology, trivia & history ). podictionary (2009-03-13). Retrieved on 2011-04-21. Archived from (the original ) on 2011-05-11.〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「pornography」の詳細全文を読む スポンサード リンク
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