because thinner chicks have sexy legs, nice stomach and look fit. As opposed to fat legs with stretch marks and stomachs that could swallow you whole. However chicks with the right curves and nice sexy thin legs is what most men care for. If you have a pretty face and your skinny not sickly skinny then you may have a chance, but if your fat i just can't do it. Their are some fat chicks who have big ol titties and pretty faces, but the extra weight i just don't want to deal with. I'm slim guy myself and i certainly don't need a fat chick on me. Gah i bet fat chicks pu ssy smells even worst because of all that extra fat and sweat.