Have you ever asked her why she used to have humor wrt sexual things and now she doesn't?

I would think that the obvious reason is that she used to be sexual. Therefore, it was funny because she felt sexy and as if you were laughing with her and not AT her. Or....I know you are not laughing at her and never would...but I am imagining that there is a great deal of not being "in on the joke". Maybe she feels left out of her own sexuality and lashes out at you.

Hairy,
What would happen if you were to march into C today and say, I am totally unsatisfied with the amount of effort that W is putting into being affectionate and sexual.

I mean, just lay it on the table.