I knew a guy who was dating a co-worker. The co-worker was the kind of girl where you literally said "wait, SHE has a boyfriend?" Well, the boyfriend was fat too and the girl gave him money frequently, so... Point is, whenever he was around and she wasn't nearby he'd talk endlessly about the hot girls his girlfriend and I worked with. I'd be willing to bet ALL men dating a fat woman would prefer a thin one, except the mentally damaged fetishists. Women don't value looks as much as men, but I think you'd be hard pressed to find one dating a fat guy who didn't wish that same guy would lose some weight.