How Porn Destroyed Sex, by professor Sam Vaknin

His English response to a begins at 1:25 (12 minutes total).

THE QUESTION BY THE INTERVIEWER (translated from Hungarian)

Based on my experience as a narcissist-coach, porn addiction and masturbation is typical of a high percentage of narcissists, even though most of them can mask it pretty good. Oftentimes, the wife or partner does not notice anything. She just experiences that the narcissist has premature ejaculation or erectile dysfunction. As a coach I learned about porn addiction that watching porn and masturbating on an ongoing basis keep testosterone levels constantly high, which causes hair loss or weakening of hair in the long run. And erectile dysfunction is often the result of intense manual stimulation by regular quick masturbation, as it is a completely different kind of stimulus than a sexual intercourse in a real vagina. And that’s why narcissists often lose their erection with their partners. And this failure leads to a vicious cycle because of the shame. What’s your view on this, Sam? Are porn addiction and masturbation actually related to sexual dysfunctions in this way?