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Old 06-24-2016, 07:22 AM
Hari Seldon Hari Seldon is offline
Join Date: Mar 2002
Location: Trantor
Posts: 11,496
It's virtually certain to be some sort of sexual selection. A more interesting question is why, in some societies, men fetishize large breasts, while others appear not to. Thus in some countries, women on average have rather large breasts and in others they tend to have small ones.

It is possible for sexual selection to get out of hand and even lead to extinction. Read about the Irish elk.