Rule34.xxx! Rule 34 animated porn, aka R34 XXX, aka Rule 34 website! Since the dawn of the interwebs (or at least since wifi was a thing), there has been a rule. A rule, or perhaps a constant, which has inspired variation, intrigue, and general weirdness – rule 34 (r34). According to Urban Dictionary, this rule is defined as… “If it exists, there is porn of it. If there isn’t, there will be. Only one known exception: rule 34 itself.” I call it, the constant which dictates that there are enough weird, horny fuckers who can draw pretty well and will find a site to upload their pervy posts for equally odd and horny people to whack it to.