I don't really know what the solution is here, it's probably terminal. I THINK he can pull out of it w/ manipulating her into realizing she's being silly, she obviously expects a man to be a woman mentally. BUT there's a point to not ALWAYS being horny, I guess. If you love your girl, you like doing the little fixes and affections, like petting a cute puppy.
IDRK what a good sexual tempo in marriage is like, my parents have a great relationship but none of my forebears seemed to have been able to wrangle their libido their whole life - grandpa was the last one to have mistresses, at least, and that's about all I can promise a girl - If exes started playing that game and turning me down, I'd find another bidder who wants what I'm offering quick enough.
I'm genuinely afraid of falling into this kind of sexless head-games cycle, always have been, because it seems like it can happen to anyone. The sex/love taps only really tighten into the 'OFF' position, they rarely open again.
(I've done the celibacy thing, the monk thing, and it's just not something I want to commit to lifelong, man. I've done pretty long stretches and I feel like I'm more incomplete like that than I am just loving my woman all the time.)