Actually, as usual, you are completely wrong. Especially give this guys age. It is the most normal thing to do. You have to be familiar with your body in it's healthy state to be able to know when it is becoming unhealth. Teens going through pubescence are prone to feel there nipples because they invariably get "a lump" there which can give mild pain. Nothing to worry about. We all went through it. I would say that if you are familiar with your body you are being negligent to your own interests.