That said I do think there has been an escalation of porn over the years. It's really apparent when you look at things from the 70s. Though apparently banning porn from cinemas shifted content to more "trashy" VHS/DVD/Online videos
I feel data-driven analytics has probably accelerated this, like a race to the bottom (pun unintended). Extremity probably drives engagement so the porn kids are exposed to today is much more extreme than what we may have been as up and coming internet users.