Quote - wanders even further off topic  every other mammal on the planet seems to manage perfectly well without breasts

Not true.  All the higher primates have breast, just not as developed as in humans.  But then, the genus Homo is the only one whose offspring take up to 12 months to even become ambulatory.  Under such conditions, close knit family groups, including the continued involvement of the male sexual partner are necessary.  Therefore, breast serve not only as a source of nourishment for the offspring, but also as a source of pleasure  and COMFORT for the spouse. 
The intrepid hunter, after a day of battling saber-tooth tigers, and slaughtering bison, sought not only gratification, but comfort in the BOSOM of his family.
As for the lower mammals having breast, what do you think the teats on a cow are?   Or what are those strange inflamations on a bitch's belly (canine) after she's whelped a litter of puppies?  The only thing unusual about the human female's mammarys, is their placement high on the chest (but then OUR offspring can't suckle on their own, they need to be held in the arms), and that  women have so FEW of them.  Other than that, everything's the same, and ebverything's normal, and Blessed be G-d that it is so!
David P. Hoadley

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