I don't have any clue as to the veracity of this, but I do know that porn was popular on 8mm and super 8 long before video tapes.
I'd agree. Possibly it's just the grammar nazi taking over in me, but I'd term that as porn FILMS, not porn VIDEOS. It's also been my understanding that projectors were still quite pricey back then: only pervs with a bit more disposable income than most would have been able to go that route. For most people it was Playboy and their right hand.