Smiles, Can you give us more info? How much of a discrepancy is there in your drives? That is, do you want it every day and he wants it 1x per month? If that is the case, then waiting around for him to make a move might not be the best option. If you want it 2x per week and he wants it once, then I can see where your dilemma lies.
I think that honest communication is really the ONLY way to resolve a sexual problem. I know there is a tendency among the HD partner to not say anything for fear of rocking the boat and turning them even further away. And from the LD perspective I see a tendency to not say anything in the erroneous belief that if you don't bring it up, it will go away.
You might want to sit him down and have a frank talk about it. Tell him that 3 times a week is your preferred frequency (or whatever it is) and that lately you have been wanting to take care of your own needs, so as not to pressure him. BUT if this is the route you take, then he must understand that there will be nights when you are unavailable to him. And ask if that is an acceptable agreement to him.
Personally I see this arrangement taking you two farther away from each other and potentially setting up a situation where you each MB because it is less fraught with tension and aggravation. But it might work!
And it might help the situation to have him know FULL WELL that you are mbating because he is not living up to his end of bargain. I think that sometimes the LD partner needs to see and understand clearly the consequences of their decision to not be available on a frequent basis to their partner. You see a lot of times that the LD person has an awakening if their spouse moves out, or has an affair, or even if they pull away emotionally.
I would have to guess that as long as all of his needs are being met in the marriage, that he will not be motivated to work on this with you. Maybe if he understood that you not initiating does NOT mean that you are not sexually active, he would be motivated to join in with you.