Women with large breasts coupled with a narrow waist have higher levels of the sex hormone oestradiol
which basically, among other things, makes them more likely to conceive and therefore a safer bet procreation-wise. They're also less likely to get osteoporosis after their menopause too for the same reason.
(Vlad the Inhaler forgot his password, Sun 9 May 2010, 15:48, Reply)