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Old 06-23-2016, 01:03 PM
Exapno Mapcase Exapno Mapcase is offline
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Join Date: Mar 2002
Location: NY but not NYC
Posts: 29,638
There is a book on every subject, which means I own a book on every subject. Specifically, I own Breasts: A Natural and Unnatural History by Florence Williams. And this exact question is asked.

But never answered. The question is raised during a look at why humans developed larger breasts than other primates. That answer appears to be for fat storage. She never gets around to a direct discussion of variability, even in the chapters devoted to breast augmentation.

I might have missed an answer, since I wasn't reading for that, so you might want to find the book for yourself. It's more breezy journalism than academic in tone and is a fast and fascinating read.