how to turn on the guy who doesn't get turned on

So I always ask my boyfriend what turns him on sexually, and he always responds with a shrug of his shoulders and says I don't know. What are some ways I can make him melt in my hands cause it's starting to annoy me. My last boyfriend and I liked the same things in the bed and I think I'm still hooked on that "idea" and "fantasy" and I need some help!!