garlicnutter - If you get your rocks off that easily, just by pressing 'play', then your interest in a real, sweaty, emotional, human sexual relationship will diminish won't it? It's an ergonomic no-brainer.
No, that's pure assumption. For the vast majority of men, the ability to "get one's rocks off" that easily doesn't diminish their interest in real relationships in the slightest. Or at least, we have no basis for believing it does. Men have always been like that (while the internet has made a huge difference to delivery mechanisms, there's no real difference between the experience of looking at porn from a website or a VHS tape, or for that matter a magazine), and have always had relationships.
Most women just really don't seem to get how this works for men. There's the pure physical, impersonal sex drive - whether expressed through having casual sex, wanking with or without porn or whatever - and then there's relationships, which include sex. For most guys, the first just runs in parallel to the second. It's not an either/or; the first isn't a symptom of the second not working properly, or anything like that.
Think of it like a man going out for a beautiful, candlelit romantic dinner with a woman. You wouldn't expect, because it's so romantic and they're both on their best behaviour and delicately savour the wonderful food together, that he musn't have or shouldn't have eaten breakfast and lunch, because they would "diminish his interest" in that dinner. Or that if he was in a hurry and lunch consisted of a bag of crisps hurriedly stuffed into his gob in the back of a taxi, that he couldn't possibly be the same person enjoying the dinner - that his behaviour at lunch is some kind of betrayal of who he appears to be at dinner.
None of which is to deny that there are some people, like thisishowifeel's ex, who seem to have serious problems surrounding porn, self-control and appropriateness. But that doesn't appear to be the case, from what we've been told, for the OP's partner. And I don't think it's the case for most people.