From an interview with sociologist Gail Dines:

In the preface of your book, you share a personal story about a conversation you had with your son over pornography. You write, “I said [to him] that should he decide to use porn, that he was going to hand over his sexuality–a sexuality that he had yet to grow into, that made sense for who he was and who he was going to be–to someone else.” How and why do boys and young men give their power away to pornography? What kind of power does pornography have in shaping boys’ and men’s perceptions, attitudes, and beliefs toward sex?
Boys and men don’t realize the power they’re giving away to pornography. They don’t understand the power it has to shape who they are, their sexuality, and their sexual identity. In this culture, we think of pornography as a joke or something to laugh about. We don’t take it seriously as a source of information that has the ability and power to impact on the way we think about the world. Most boys and men go to pornography for an ejaculation; they come away with a lot more. I don’t think they’re quite aware of it.
Pornography, like all images, tells stories about the world. It tells stories about women, men, sexuality, and intimacy. In pornography, intimacy is something to be avoided, and–as I say in the book–“In pornography nobody makes love. They all make hate.” The man makes hate to the woman’s body. It’s about the destruction of intimacy.
Is it true that what most boys and men see in current trends of pornography are things that they expect in sex? How did that happen, and how is it impacting on boys’ and men’s perceptions, attitudes, and beliefs toward sex?
Well, a lot of people don’t know what pornography is. The first thing I do in the book is very purposefully describe it in detail. I know that for many people it’s going to be hard to read. I understand that. But if you’re really going to understand what I’m saying and why I’m saying it, then you have to understand the material I’m talking about. A lot of older men and women think I’m talking about Playboy from 15 years ago: a centerfold or a woman with no clothes on smiling in a cornfield. They think, “What’s wrong with that?” Well, that was bad enough in the way it objectified women, but we’re on a whole new level now with this kind of imagery.
How it got to this point is the Internet. It made it more accessible, affordable, and anonymous. You’re seeing a massive rise in use, and the users are getting younger and younger. Children who are 11½ years old are now looking at pornography because it comes straight into the home. There’s no limit on how much you can access. It used to be you had to steal father’s Playboy or Penthouse. Use was limited to how much you could actually pilfer. Today it is unlimited.
So what happens is that desensitization sets in that much quicker and that much earlier. In order to keep the consumer base going, the pornographers have to keep upping the ante. They make it more violent, body-punishing, or abusive as a way to keep men interested. When you think about it, if you’re exposed to it at age 11 or 12, you’re jaded by 20. You’re certainly jaded by 30. Pornography bleeds sex dry of intimacy, emotions, and connection. Once you do that, then there’s not much left. It becomes boring and mechanical. So you have to keep feeding newer and newer ideas just to keep [the audience] interested.

Read the whole thing. I intend to be very strict with my children about their use of the Internet, with particular respect to protecting them from porn. But I’ve got to tell you, I fear for them all, especially my daughter, trying to find a suitable marriage partner in a world in which so many of their peers will have grown up with widely-available pornography.