is Ron Jeremy so popular?

Question:because he had a badger-horn

Best Answer - Chosen by Asker: because he had a badger-horn

He is a 70's cheesy porn star (that was) able to service himself and has allowed himself to be used for silly and goofy bit parts in next to anything to keep his name out there...

Well, he got his fame from his contributions to the porn industry. I believe he's well known because of his oversized "manhood". But he's also made efforts to cross over into other aspects of the film industry which has brought his popularity to another level. Kind of like what Jenna Jameson is trying to do with her career. They both appear to be using porn as a stepping stone instead of just being content with that lifestyle.

porn star that was supposedly "well endowed"

because he could suck his own pianist, which means he had a big bazooka and could get it up on a stiff wind,,