I don't want to get in the middle of this debate, but wanted to give a possible solution to the porn surfing problem for the parents out there. I work for the Catholic School Board, and this is what we suggest to our parents to use at home:
http://www.k9webprotection.com/
It will never take the place of good parental supervision, but it does an excellent job of internet filtering. Best of all, it's 100% free.
Just thought I would throw this out there.