I’d wager that if PE ever became widely known to the populace, it’s popularity will increase and then vastly decrease. It’ll increase at first because, hey, who doesn’t want a large cock, but then it will decrease because of human stupidity. Fellows all over the world will do it wrong, and when some kid tears off his cock by accident from a stretching experiment gone wrong (or something on those lines), news headlines will warn people not to PE. A major public backlash would eventually form.
Well, that is how I think it would go :P