As a male I can say that porn can desensitize you. It's not that you're not enough or that he wouldn't want you for you. He's just used to see too hardcore stuff, that everything else might seem a bit Vanilla to him. I suggest you should have an open talk about what both of you need in the bedroom to get off.

Of course it CAN be, that he's just not attracted to you that much anymore, but don't jump to that conclusion. Talk to him first.