Porn-- Redtube-- And Children

My son is 11, going thru puberity, and heard of redtube from talk at school *A Porn Site* FREE EASY TO OPEN TO POLLUTE MY CHILDS MIND... I don't think these sights should be aloud to exist?? Alot are more worried about banning Poker off the Internet than taking care of this manner. To be truthful to me Porn is sad. Expecially when it is just said Here Child... Here... Adult Content should be for Adults. Sure some will say, watch your child... It is hard for the working Parent, that can't sit here on a sight and talk about these problems, must less hawk their child. Kinda like the CRAP they put on TV for our children... That is another topic.. WOW... How can we take a STAND?? What can WE DO??? Would you be willing to HELP???