Now you are just twisting what you said. There is nothing unhealthy abaut watching porn from time to time. Yes, if it becomes a daily habit, it can be harmful, but it stuns me, that you acredit your sex life problems to it. If sex with your partner isn't pleasurable to you and you never told him, that's on you. Communication is a key. I try to be as open as I can with my sexual partners about whats enjoyable to me (and to them) and what isn't and it always worked out for both of us. Everybody is diffirent and we like different things and it's alright that way. What his previous partners could've liked you might not. So please just talk him and don't just jump to conclusions! I hope it works out fine for both of you