Well I'm not a male Maria but I'll put my 2 cents in anyway. I raised 2 boys, the younger of whom was 13 when I got internet access at home. I never censored the internet in any way for any of my kids anymore than I have ever censored a book. Certainly both boys enjoy internet porn but neither of them are twisted perverts. The oldest is married to his long time girlfriend and the younger one has had a longtime relationship but is not yet married. Both of them work with women easily in a professional environment. I have always felt that the best way to handle any of the "forbidden" subjects is to talk about it and air it out - it becomes far less of a temptation if it can be discussed. You should have heard some of our dinnertime conversations over the years My daughter is 10 years younger than the boys and she grew up on those dinnertime conversations - she is a pretty savvy 15 year old.
Ultimately I say let the kid surf where he wants to and then talk-talk talk about all the ramifications of sex and where porn fits into it.

Kathleen