Because male reproductive success in humans depends heavily on mating with reproductively capable females, selection over thousands of generations should favour those males who prefer to mate with reproductively capable females.
Unfortunately for us stupid men, reproductive value and fertility are not attributes that can be observed directly. Breasts are an indicator of reproductive value and fertility. ie: they show that a girl is nubile, healthy, and of reproductive age.
Breasts are a cue our brain picks up on that tells us the girl is nubile and fertile. Hence men are genetically predisposed to like "firm, round (saggy, mishapen = old, and not fertile), large (girl has gone through puberty), etc." breasts as these indicate all the features that selection would have designed us to respond to.
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The intelligent man wins his battles with pointed words. I'm sorry—I meant sticks. Pointed sticks.
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