Originally Posted by EBlend

I'd agree. I remember being a teenager and worrying whether I was developing "normally." He might just be checking to see if he looks "right." I remember having a lot of anxiety about that. I also remember wondering a lot if I was just too small, and eventually found out I am on the large side. Do you think he could just be dealing with normal adolescent anxiety and trying to compare? Perhaps if that's the issue and you tried to get him to talk about it, he might be feeling too embarrassed to talk about it. . .? Perhaps if he keeps doing it, you could gently ask him that very question, but gently; and if that IS the problem, maybe he'd say so with a more direct approach. If that's not the problem, I'd guess there'd be no harm done if you ask in a kind way.