Another possibility is that he says he's willing to give it a go, but he's only saying it because he loves you and wants to please you. Maybe it's just not his thing at all. Maybe he just doesn't know where to start.

If he doesn't know where to start...well, thats easily fixed! I'm sure you'll be more than happy to give him a few pointers

If he's only going to do it to please you...well, you either have to let it go, or go on with him not really into it. And that can stale a relationship really quickly (speaking from personal experience)

Just thought I'd add my two bob seeing as this is something I've been through recently.
Good luck to ya!