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Old 06-23-2016, 06:20 PM
Hail Ants Hail Ants is offline
Join Date: Jan 2000
Location: NY USA
Posts: 7,635
It's been a while since I read it, but in socio-anthropologist Desmond Morris' book The Naked Ape he posits the idea that large, permanently swollen human female breasts evolved after walking upright, as a way of mimicking the curvy round shape of a woman's ass. IOW it makes her look sexy (while standing on two legs) from both front and behind.

I don't know if there's any official statistics, but I would guess that average size breasts are, well, the average. That overall they don't really vary that much in size, that extra-large or small ones are statistical anomalies. But they all get noticed roughly equally because, well, guys are hardwired to notice them no matter what.