If his theory is correct then porn consumption becomes the benchmark for "interest in sex". If you extend that logic, that would mean that men who don't consume porn, aren't as interested in sex as men who do.
I call this the "prude" theory of marketing. People who criticise porn are put in a little box on the shelf and labeled "prude". In this way pro-porn men can control other men by shaming them ... implying that they are are not as "interested in sex" as they perhaps should be and by implication are not real men. Consuming porn becomes the new benchmark of sexual sophistication, everyone else is a loser, a prude, or worse .... possibly sexually dysfunctional without enough "interest".
Bingo! Men, YOUR sexuality has just been hijacked and defined by others. Your sexuality becomes defined by your porn consumption. This is indicative of your "interest in sex" (or lack therof).
[Among other things, this line of logic is a marketing ploy of the porn industry. It works like a charm. ]
Most reasonable people would equate a serious interest in porn with a serious interest in sex. And again, most people realize that men are, on average, more sexually driven than women. And finally, most people don't need academic studies to know that.