I wouldn't be too considered with him just watching porn unless of course it's becoming an addiction and it's effecting his daily life and relationships with people. At the end of the day most boys are going to be curious and watch porn and masterbate at some point in their life. I wouldn't really address it unless it's changing his behavior in a negative way. If he is seeing sp's I would warn him of the financial burden that it can put him in because seeing escorts is a really hard addiction to break and of course always be safe and wear condoms