Rhapsody, those porn sites can infect your computer with trojans and other viruses, plus some sites will charge you for membership. I don't know how that happens, but before I busted my husband on the very same thing, he got stung for $500!!

Your son should know that anyone that sends him a link is going to be to a porn site, no ifs, ands or buts about it! It is YOUR house, YOUR computer and YOUR rules. What YOU say, goes! No ifs, ands or buts about that either! If I have the right to tell my husband, who lives here and helped by the computer "NO PORN!!!" then you sure have the right to set those limits for your son who is there temporarily.

Some servers have "parental controls." Something to think about if he insists on breaking your rules.