Pornography is generally classified as either softcore or hardcore.
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If the position of the objects in the last frame is about the same as the first frame, there is the illusion of continuous action.
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Pornography can be classified according to the physical characteristics of the participants, fetish, sexual orientation, etc.
Pornographic images may be either scanned into the computer from photographs or magazines, produced with a digital camera, or a frame from a video before being uploading onto sexy clothed pornographic website.