The other fear about saying something like "Oh, no thank you, dear, I'm just not in the mood to devour you tonight..." is that she would not believe it and either think that you are finally cheating on her or that you're being a cold-hearted jerk that is taking revenge. In either case, at least for me, it would lead to problems. I'd love to be able to be the one in control for a change instead of the dog begging for a bone.
