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(We also found some examples where opposites attracted: Morning people tended to pair with night owls, and people with a good sense of direction with those who lacked one.) There are at least three reasons we so often message and eventually mate with the similar.
And after we start dating, we may grow to be even more alike.
We make genetic discoveries by combining DNA from saliva samples with thousands of survey questions, some of which you might find on a dating site — “Have you ever cheated on a long-term relationship partner or spouse?
” — but many you wouldn’t — “Has a doctor ever diagnosed you with Parkinson’s disease?
Men follow the first: Short men prefer short women, and tall men prefer tall women.
Women follow the second: All women prefer taller men, but tall women display a stronger preference for tall men.
These couples have actually met (and mated, though we don’t know if they’re still together), they’re sometimes answering questions about matters of life and death, and they have much less incentive to lie.