To be honest, I don't really have a strong say-so either way on the issue of child molestation. I'm not going to partake in the act of it, but I also feel like we shouldn't command at what age a person stops being "young" and starts being "mature".
I don't agree with it if you go so far down, but to me 18 doesn't seem like a reasonable age for this. I mean, I wouldn't mind if the age of consent was lowered down to 14. Your body is ready for such acts at that age and if you can't decide if you want to be doing those acts by that age then something is seriously wrong.
I'm not saying I take fancy to child molestation, but there becomes a point where you can't just lay all of the blame on the adult. If a 21 year old guy and a 16 year old girl do it and she told him she wanted it, then you can't say that the man was the only one that did a wrong.
In my opinion, if it's under 14 years, then the offender is the one who should take the blame, however there is no treatment for this thing. There is no way to wire yourself into someones brain and re-write what's already there. Prison is the best punishment for these crimes in my eyes.