Breast augmentation gets bigger boobs, which increase a female's attractiveness to the males of her species, increasing her chances of reproduction and passing on her genes.
That ultimate cause is actually divorced from the proximate cause. You'd need to present data suggesting that people who have breast augmentation have more kids.
I make a semi-serious statement about why women would choose to get breast implants (the first part about attracting males was serious, second part about kids wasn't), and you go and pull something like this? Seriously, what the hell is up with you?
Because this is an actual topic in evolutionary psychology, and one that's commonly misunderstood.
I'm correcting the common misunderstanding.
In any case, women's assessment of their own bodies is badly divorced from men's, largely due to the interference of cultural messages. Women generally believe that men want larger breasts and thinner waists than they actually do.
You should be careful about ascribing ultimate cause motivations to traits that are explained by proximate causes. The original reason breasts became attractive is because they signaled reproductive fitness, but that is only an ultimate cause; it generated proximate causes which are now sufficient on their own.
