Ron is a crossover cultural icon who's appeared on "legitimate" venues.  I suppose it's the combination of middling comic talent and his rather unlikely appearance.  Plus, he's one of the few holdovers from the 'porno chic' days of Deep Throat and DMJ before E. Meese and J. Falwell et al made sex dirty again. 

"Democracy is a pathetic belief in the collective wisdom of individual ignorance." - H. L. Mencken