Rule 34 is an Internet meme and slang that states that, as a rule, Internet pornography exists concerning every conceivable topic. The concept is commonly depicted as fan art of normally non-erotic subjects engaging in sexual behavior. Rule 34 may have originated from a webcomic , captioned "Rule 34 There is porn of it. No exceptions. Internet users have made Rule 34 into a prevalent meme , owing to the ubiquity of Internet pornography , especially among genres such as fan fiction , slash fiction and hentai. In May , a Rule 34 database was launched on Paheal.