There's been porn since the dawn of man.
Not high speed broadband unlimited streaming video porn. In a single session you will see a hundred girls, pussies, tits performing all kinds of hardcore stuff. Back in the caveman days a guy would be lucky to see that in a whole year. Modern internet porn totally overloads and desensitizes the brains reward circuit. It's like taking drugs, or gambling or eating junk food, all which can cause negative effects on the organism of done often.
Girls and sons who have not been loved by their...
No, but I'm serious.
Anyway, if you think about it, locking yourself away in a darkened room with your pants around your ankles, furiously masturbating to a two dimensional representation of a woman (or a tranny since women don't get you high anymore and you had to go for the harder drugs) in order to trick the primitive part of your brain into thinking that you are reproducing with a real woman, is, well you decide.