@ Other people in this thread
If I do have children I don't plan on restricting anything. David Mills put it well; if you hide pornography and stuff of that nature it's going to tempt children to want to see what it's all about. Imagine if French Ballet was banned in the U.S.. Wouldn't millions of people, a large percent of them being teenagers, see why it's condemned? I know I would be up for hours on end wondering what the fuss about French Ballet was.
I apply the same kind of thinking with other things too. They should be able to try and experience what they want, in moderation. I know when I was growing up my mother never came into my room at the wee hours of the morning when I was up to see what I was doing, which, although at the time I liked, was bad.
Kids should be able to experience what they want, when they want. Just not too much alcohol/drugs.