Desire is still not going to be based simply on the fact that hey may work out to keep his body in the shape she might like....it is not as simple as basing it always on just what HE does. Outside influences DO affect people's libidos...maybe not yours, but it DOES affect MANY people's. Just the plain and simple fact that she has now clued us in to the fact that she's helping her mom with her cancer is enough to be a big drain on her energy levels.
So her H could (in your example) work out and keep his body in shape and her libido could still take a nose-dive right now, and it would have NOTHING to do with what he's doing or not doing. Sometimes life just simply interfers. For a woman...desire will never be based just on one, two, or even three things...many things influence our libido....and has already been pointed out to you "desiring" is not a choice we make, we can WANT to desire, but we cannot make ourselves do so.
