I chose the "I think social bias influences pairings, but there are too many confounding factors to make a difference in the long term" option.
Part of me does believe that divergence is inevitable, considering mate selection seems to indicate that humans naturally do gravitate in the manner in which you described. However, everything in our society is so freaking "trend-happy" to the point where I believe there could potentially be some confounding factors that would sabotage the divergence.
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