Do men actually just want sex for their birthday?

My husband's birthday is tomorrow. I've asked him at least 5 times what he wants, and he keeps saying "sex." I'm not sure if he's joking, but personally, that's not something I would want (clarification: not something I would want for my birthday present; I’m more than happy to have sex on his birthday!). I'm considering getting a cute outfit from the adult store to make it more fun, or what else could I do to make it better? Yes, I’ve already asked him, but he's not giving me much info back. Update: I took all your suggestions and plan to “put on a show” for him tonight. Thanks, you all, for the feedback and responses.