If you look at the animal world, a lot of male animals ensure that they get laid by eliminating their competition. Either they challenge the other males, and fight until their competition is docile, or they patrol a territory, not even letting a single other male get close. Unfortunately for humans, there are laws to prevent this type of behavior. What this has led to is a surplus of male competition for a limited number of females. This in turn has led BBW to be extremely choosy, and doesn't necessarily guarantee that the most physically dominant male gets the girl. Thanks to all of these extra males, women's egos are blown through the roof, and in a lot of cases, BBW get stuck with analysis paralysis when choosing a male. In the animal world, the most dominant male is what the females get, and there isn't much for them to decide on. Either it is they will mate with the dominant male, or they don't get to mate at all.