Many people are completely in the dark that their partner likes porn, much less has a serious relationship with it. Ignorant as to any issue, they trust their lover unconditionally. They assume their partner understands that using porn, at least beyond a magazine like Playboy, is the equivalent of having an actual affair. This ignorance, combined with the great lengths to which a porn enthusiast will go to hide erotica, can leave a partner in the dark for months or even years.
This is tossed off as though it ought to be obvious to the ordinary reader. It strikes me as obviously insane. I can think of any number of valid concerns one might have about what sort of porn one’s partner is consuming, or the extent of it. But the proposition that one of them is any similarity between porn viewing and “having an actual affair” would not have occured to me. Is this view held by any significant number of sane people?