Believe it or not, I've never personally seen any porn, although as a teenager (rebellious idiot that I was) I read a little de Sade and it utterly nauseated me. Hard to imagine that in the Victorian era they had rampant bestiality, torture and homosexual porn... Although i wouldn't know one way or another.
The difference is this: in previous times, porn was written, or in the early days of photography, a few still pictures. It was illegal, and/or shameful. It was behind closed and locked doors.
Now? Living color, live action, and potentially in every home. "Adult" stores everywhere you turn. Society is saturated with it, and stuff that is now on regular TV is rife with highly charged sexual content.
Odd then that sexual assault rates are down substantially over the past few decades.