From the article-
> There are studies that demonstrate that porn viewing desensitizes ones genitals and reduces white matter in the brain. https://www.wired.com/2014/06/is-it-really-true-that-watchin...
Then from the article they linked to in order to justify that claim it says the opposite-
> It's just as likely that men with less grey matter in their striatum are more attracted to porn, as opposed to porn causing that brain profile. The researchers know this. "It's not clear ... whether watching porn leads to brain changes or whether people born with certain brain types watch more porn,” Kühn told The Daily Telegraph