She is insanely hot WITH the extra weight!!!
Real men like real women, simple as that. Look at the great works of art of the past several hundred years (pre-Twiggy). Not a rail-thin woman among them... and even if a woman was skinny in real life, she wanted the artist to paint her with extra curvature, as that was considered more attractive. It is only in the past few decades, when women were required by the fashion industry to look like prepubescent boys, that the ideal of feminine beauty changed. Now men think they have to like skinny women because that is what society has forced on them (though, granted, some men do naturally prefer that particular look). But I maintain that if you took away societal conditioning, men would return to their primal nature -- and that means being drawn to a more curvaceous woman, as she represents fertility and strength.
P.S. I'm a man, not an "overweight woman"