BeeDeeDubbleU - 8:50 am on Jul 24, 2013 (gmt 0)
I have a friend in Italy. She was telling me that on the school bus a teacher caught several kids accessing hard #*$! on a phone on the way home from primary school. We are talking about kids aged from 6 to 11 here. I am sure that this situation is being repeated virtually every minute of the day somewhere in the World.
Kids, being kids, do look for it and they know how to find it. They are not stupid. The only way you will stop them from finding it is to put it outside their reach.
(And I would trust even Soho bookshop owners to deny access to this material to primary school age kids more than I would trust the Internet.)