Thank you for posting this. This is a topic that I've long been fascinated by but never knew anything about. I'm way in the older end of the bell curve of age distribution of Hacker News readers, so I've personally experienced how pornography has evolved over the past thirty (or so) years, i.e., ever since I became curious about sex and turned on by naked women. And without a doubt the "hardness" and easy availability of pornography today is in a completely different universe to the sort of pornography I was consuming when I was thirteen years old. There's no escaping the fact that pornography must do _something_ to children's and teenagers' minds, in terms of expectations about sex, their own self-esteem, or whatever, and I've often wondered what these effects are.
Moreover, and moving on, now that I'm a new father with a two-year old daughter, I cannot even _look_ at pornography without feeling queasy. The full nastiness of the activities, production, what obviously goes on behind the scenes, etc, hits you in the guts and is truly sickening.