Like I said above, the mass majority of all men look at porn. The mass majority of men are not desensitized to real sex because of porn. If a man were desensitized to sex, that would probably be because he's jerking it too hard, too fast, and too frequently. He got used to the feel of his and and can only get off to that. Same thing for a woman using a vibrator. That's not porn's fault, that's his fault for the way he used it. And it's not permanent.

Also, saying that too much dopamine causes depression is just not biologically accurate. Too much dopamine causes schizophrenia and psychosis. So if you're jerking it until you start hearing voices, then yeah you probably have a problem.