I let my husband look at p 0 r no on line, but I feel like real time interaction, especially CAM would totally cross the line. He obviously has a problem, and possibly even an addiction. I seriously would consider this "cheating" and yes, possibly a chance for meetings outside of computer play.
I'd get to a marriage counselor, and possibly get him to a counselor alone to discuss this behavior.
He's a grown man. I don't think telling his parents is appropriate. He needs to be accountable to himself and to you.
You are not being unreasonable. This is bad behavior. But you need to put the kabash on it, pronto. A marriage counselor will help with your trust issues, or rather, enable to sort out those trust issues.