I think it depends on how you are skinny. If you exercise, eat healthy and are slim/skinny, then you are more likely to have boys I think. But if you are skinny because you are not eating, starving yourself, watching your weight all the time and just eat the bare minimum and not a whole lot of meat, then you are more likely to have girls. As for women who are not skinny, that also depends too. If you are heavy, but on a diet because you are trying to lose the weight, you are more likely to have girls. That's what I noticed from friends so it's not really scientific.