Is my son a addict?

I have a 13 year old son who has been introduced to from some of his school friends. We have confronted him and told him he could talk with us about anything. He has told us that he feels guilty for seeing these things. We believe that he is now been tainted by what he has seen. Now, he has become extreamly courious of his own body. I'm afraid that this type of behavior will cause him to be a addict.