Wow, I knew your moral compass was busted, but DANG!!
Civilization got on just fine without any significant distribution of porn for thousands of years. You're looking at one of the downsides of the information age and extrapolating it to be an integral part of the human nature. Morally bankrupt and intellectually sloppy.
No porn, eh? Ever seen what was all over the walls in Pompei? Porn of some sort has been around since the beginning of time.