Just my view, but I think that a lot of (seemingly) LD men use porn extensively. (or maybe it's just that men, in general, use porn extensively).
Think about it from their point of view. It's easy, thanks to the internet. It's (often) free. And it's no strings attached.
There's no sticky emotional attachment, no one to confront them with a performance evaluation (however nicely done), no concerns about their "partner" being unsatisfied.
I had absolutely no idea how much porn X used, until he accidently downloaded literally 100s of pics onto my laptop. Wow.
And obviously, there's a serious problem when porn becomes a substitute for the real thing. But I can see why it happens. And why it's so difficult to change.
Also, just wondering....(though maybe this has been addressed before) do HD men find themselves more drawn to porn as a substitute for not only an unavailable W, but also a more acceptable substitute for an affair?