I caught my 12 year old son ... do I get him counseling? Do I give him "the talk"? What do I do?

Well, he was ... it's very WRONG. And its unnatural and unhealthy. Right now I'm on his email to see if he's ordering or something. Its unnatural!!! They say its just puberty... but I think its just wrong... I need advice. I'm sorry if I offend anybody, do not badger my son. But he doesn't know I caught him. Or that I'm going through his email, and room.