Rule 34

Rule 34 

Refers to one of the Rules Of The Internet originally coined as a 4chan meme which essentially states: "If it exists, there is porn of it." In fandom, this rule means that if a fan can conceive of a topic, be it kink or pairing or whatever else have you, someone else has likely already written it. If not, the corollary Rule 35 states that such porn will soon be created.