Porn is usually pictures or literature that involves people in any sexual activity. Porn is usually determined by the format in which it is presented. If the printed matter, pictures or literature is intended to promote sexual arousal then it is considered porn. On the other hand, if a photograph is intended to show the beauty of nature, such as a naked man or woman, and no sexual intent is provided, then it is considered an art form by some, and is not considered to be porn