I definitely concur with @Simon2 and @Jlied. Us humans have always masturbated in one form or another, probably starting all the way back in some ancient masturbatory rite or something lol. However, it would have been completely different than the modern phenomenon, and mostly vanilla; thinking about that girl you had a crush on in the next village, or the pig famers wife with big tits etc. Of course, a few of them might have been actually addicted to it, but in general it would have had to have been pretty 'normal' and nothing crazy. Also, considering how easy modern life is, this has to contribute something to this problem as well. Back in the day, life was not as easy or comfortable. It's only with modern technology and the opportunity of novelty and escalation in genre, that this beast has been unleashed to the masses with all of its devastating outcomes. As for myself, I have no urge to masturbate when I'm not looking at porn, they've always gone hand to hand.