Scabs, you might need to find out WHY she can't/won't have sex every day. Frankly, I'd be surprised if any man DIDN'T want it every day. I might not choose to give it on any given day, but I would never categorically refuse. It sounds like she either thinks it is somehow wrong to have this level of sex drive, or that it is unreasonable for you to be asking for it so often when you know she'll refuse. You want to make sure it's not the former, because that is important--she can't be thinking that a normal sex drive is "wrong", for both your sanity's sakes.
If she is just thinking you are uneasonable, find out why. Is she too busy/tired? Make her life easier! Pick up take-out (HEALTHY food) on the way home, find a babysitter, and promise to wash the dishes--then invite her to make love during her newfound free time. She will enjoy the break from the daily chores!
It's really good that you are staying in shape, and that will definately help. But keep in mind that her sex drive is not really all that dependent on your appearance--if she wants to make love to you, she will think you are hot stuff. If she doesn't, then she won't. With me, if I'm feeling normal, Kel looks smokin...if I'm horny, I can't even be in the same room with him if I need to do anything other than jump his bones. If I'm mad/tired/sick, well, I don't really care what he looks like, nothing's gonna turn me on. Just trying to make you feel better--it's not that she thinks you're ugly