Some would argue that there are only so many biological resources for evolution to designate. Attractiveness (i.e. larger breasts, genitalia, etc.) is more prominent in less developed countries, where "live fast & die young" is the dominant survival mechanism to offset higher mortality. This becomes more vestigial as time goes on, and in more developed societies, but so called "peacocking features" remain in the genepool. It has been shown that in women, attractiveness (divided into certain objective categories) can be associated with lower IQ.

There's a lot more to this, but that's the gist.