Men Biologically Wired to Be Nurturing FathersJennifer Corbett Doren at WSJ.com: The study, led by Northwestern University researchers, followed a large group of men in their 20s and found testosterone levels fell after they found partners and became fathers . . . lower testosterone levels could help men who are fathers better handle the demands of parenting and allow them to become more nurturing . . . The new study, to be published this week in the Proceedings of the National Academy of Sciences . . .
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