"Harmful to children", where did this phrase come from? Odds are it was originated by an adult (18 and over). Child censorship is an issue we shouldn't ignore. No child above 12 years old should have restrictions about what he or she might get to see or hear.
Let's say a child of 13 wants to play a mature video game containing gory violence, nudity, and sexually stimulating situations (although no real sex is involved). Instead of taking away any chance the child might have of seeing it, sit down with your child in a "one on one" and calmly discuss it as if you were in a college debate.
Really consider these points instead of just disregarding them, and enforcing your own law. Become a "cool" parent in your kid's eyes by treating him or her as an equal, and your bond can only get stronger.
I'd like to stress, I am not a parent, nor am I a professional in child psychiatry. I just remember how I felt growing up, not that my parents didn't do a good job of raising me. I just think the "old school" way of thinking, is really not good enough.
I'm sure it was written here before, but I think it bares repeating: For more information, visit esrb.org (contents must not be copied and links within site must not be posted).