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Pornographic films or sex films are films that present sexually explicit subject matter for the purpose of sexual arousal and erotic satisfaction of the viewer. Pornographic films present sexual fantasies and usually include erotically stimulating material such as nudity. A distinction is often made between erotic films and pornographic films on the basis that the latter contain more explicit sexuality and usually do not claim any artistic merit, or aesthetic appeal. Pornographic films are produced and distributed on a variety of media, depending on demand and the technology available, including traditional film stock in various formats, video for home viewing, DVDs, Internet download, cable TV and other media. Today, pornographic films can be sold or rented on DVD, shown through Internet streaming and special channels and pay-per-view on cable and satellite, and in rapidly disappearing adult theaters. They are generally not permitted to be shown in mainstream cinemas or free-to-air television. Films with risqué content have been produced since the invention of the motion picture in the 1880s. Production of such films was profitable, and a number of producers began to specialise in their production. However, various groups within society considered such depictions immoral, labelling them pornographic, and attempting to have them suppressed under obscenity laws, with varying degrees of success. Such films continued to be produced but could only be distributed by underground channels. Because the viewing of such films carried a social stigma, they were viewed at brothels, adult movie theaters, stag parties, at home, in private clubs and also at night cinemas. Only in the 1970s were pornographic films semi-legitimized; and by the 1980s, pornography on home video achieved wider distribution. The rise of the Internet in the late 1990s and early 2000s similarly changed the way pornographic films were distributed and furthermore complicated the censorship regimes around the world and the legal prosecution of obscenity. ==Classification== Pornographic films are typically categorized as either softcore or hardcore pornography. In general, softcore pornography is pornography that does not depict explicit sexual activity, sexual penetration or extreme fetishism. It generally contains nudity or partial nudity in sexually suggestive situations. Hardcore pornography is pornography that depicts penetration or extreme fetish acts, or both. It contains graphic sexual activity and visible penetration.〔(【引用サイトリンク】title=P20th Century Nudes in Art )〕 A pornographic work is characterized as hardcore if it has any hardcore content. Pornographic films are generally classified into subgenres which describe the sexual fantasy which the film and actors attempt to create. Subgenres can also be classified into the characteristics of the performers or the type of sexual activity on which it concentrates, and not necessarily on the market to which each subgenre appeals. The subgenres usually conform to certain conventions, and each may appeal to a particular audience. 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「Pornographic film」の詳細全文を読む スポンサード リンク
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