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Old 06-23-2016, 12:19 PM
robby robby is offline
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Join Date: Dec 2000
Location: Connecticut, USA
Posts: 5,100
My WAG: women's breasts are a secondary sex chacteristic that, for many men, heavily influences their attractiveness. This in turn affects whether or not women with certain breast chacteristics are likely to reproduce and pass the relevant genes on to their progeny.

All men do not have the same preferences for a given breast size (which is also affected by social factors, I expect), so it is not surprising that a wide variation of breast sizes might arise.