So do men really want women with big boobs? Some do, at least in fantasy, hence the joke about the woman who gets the job. But many prefer.
Why do straight men devote so much headspace to those big, bulbous bags of fat drooping from women's chests? Scientists have never.
If you're asking, "Why do men like boobs?," the answer is simply, "Because Women constantly ask me whether big boobs are better, why fake.