If breasts are simply fat deposits, why didn't they develop in men too?

It has been shown that there's no correlation between breast size and milk production in women (if that were the case, flat-chested mammals couldn't nurse their offspring). Therefore, big breasts only exist to be looked at and are almost unique to human females, which suggests that they have been selected... show more It has been shown that there's no correlation between breast size and milk production in women (if that were the case, flat-chested mammals couldn't nurse their offspring).

Therefore, big breasts only exist to be looked at and are almost unique to human females, which suggests that they have been selected for.

My question is: why did primitive men found big-breasted women attractive but not the other way round? Why didn't most primitive women like big breasts in a man?
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