Hmmm. Interesting study, for sure. And not, I think, all that surprising - I don't think anyone has ever established a link between looking at porn and any increase in rape. Such a link has been
asserted often enough, even back in my youth, but never shown to actually exist.
I never was the rapist type, myself: I'd let porn and/or wanking substitute for even getting up the courage to ask a girl for a date when I was a young pup.