Humans are by an OOM or more the most complex creatures to arise from raw natural selection; about us we have constructed a fractal diversity of society and culture.

Humans are animals, yes, but they have long transcended the ordinary pressures of environment and selection. In a stupor, trying to comprehend our exceptionalism, we intuitively and nonsensically describe much human behavior as "unnatural."

Your crude reduction of human reproductive choice denies myriad past choices made in free will, subsuming both the terror of power and the rare true love to biochemical animism. Go far enough down this path and you will assign to animal spirits the abstract free will you deny, accidentally recreating primitive religion & symbolic thought, thus elaborately disproving yourself.

We're obviously animals. That's a place to start, but not an insight. Contending otherwise is insight to the soul and pain of the speaker, not their society.

The end, the ur-insight: a universal theory which succinctly predicts homosexuality, Dennis Kuchinich's marriage, the Ptolemaic family tree, the fate of the Sabine women, and Kate Upton's romance.

Are you sure? The definitions of fitness are very vague here, and not just measured on wealth. There are plenty of wealthy women with less-wealthy boytoys and trophy husbands. There are increasingly plenty of hardworking breadwinning women with stay at home dads. A man who lives to work and has no real domestic skill is increasingly unattractive.

Feels to me like you're completely discounting an "Uptown girl" scenario. There are many instances where one might be looking for a downtown man (disclosure: That's what I am.)