Ergo - those of us who would allow our children to read the Da Vinci code do not have high standards?
The thing is, you are going to censor that which your child is exposed too, you decide what is appropriate and what is not . . that's all well and good if you're an extremely broad minded individual but if you're not (and I have no idea which you are) then you will vastly limit your childs opportunities to learn and ask questions. If you don't allow your child to learn and explore on their own then all you will do is create people who parrot whatever the authority figure in their lives tells them.
Edit to add: My husband (bless him) just pointed this out to me, I do censor what my children watch on TV, I don't allow them to watch films which are not appropriate for their age, things which contain violance, sexual scenes and bad language that kind of thing . . however as I'm only censoring because I don't believe they are suitable for 7 and 8 year old children, it goes without saying that as my children get older then I will censor less until they are old enough to decide for themselves.