Try bargaining; you'll stop asking if he starts giving. You can even work out a schedule that doesn't sound too bad to either of you, which doesn't sound appealing to me, but I've read it works for some. Or, make the bedroom more inviting to intimacy--clean with comfy pillows and powdered sheets, etc, and don't ask for it--just treat him like when you were still dating, all day long, every day, wear something exciting to bed every night. It can't be worse than asking for it and still not getting any.