"But at least among the recent cohort of young adults in this study, partner choices do not seem to be driven by hypothetical evolutionary adaptations that cause men to value beauty and women to value men’s ability as breadwinners. That this gendered beauty-status exchange does not occur casts doubt on the sociobiological account of partnering: If evolutionary adaptations for beauty-status exchange exist, they are less impervious to social structural counter-forces than usually assumed in sociobiological models."

"the main focus of this paper was to test whether exchange (hypergamy) or matching (assortative mating) best accounts for partner selection among typical young couples: This analysis finds evidence in favor of matching. A secondary focus was to test sociobiological and market models of partner selection. By failing to find evidence of gendered beauty-status exchange this paper questions the importance of evolutionary adaptations in determining partner selection among modern young adults. Moreover, by failing to find any evidence of exchange (gendered or gender-neutral), this paper questions the validity of the market model of partner selection. Instead it suggests that social structural barriers and a desire for compatibility and companionship may be the most important determinants of partner choice."

http://paa2011.princeton.edu/papers/111953

about the sample - "From among the current sexual relationships of at least three months duration, approximately 500 dating, 500 cohabiting, and 500 marriage partners were selected to complete a slightly modified version of the Wave III interview: These 1,502 couples comprise the Romantic Pair sample."