Rating systems are okay, they help parents.
I feel there is a place for censorship to protect children. Generally I am against censorship, but this book shows the harm that can be done, and graphically at that. I haven't made up my mind whether this is a good book yet, but I read it in 2 days as I had to read just a bit more each time I put it down. I would warn you that it is a very disturbing book that deals with the effects of pornography on children and is told from their point of view. It does not preach and say this is wrong and you must not do this, that or the other.