Men with more "masculine" 2D:4D ratios tend toward higher levels of aggression and math scores; more assertive personalities; higher rates of ADHD and autism {diseases with strong male biases}; and decreased risk of depression and anxiety {disorders with a female skew}. The faces and handwriting of such men are judged to be more "masculine." Furthermore, some reports show a decreased likelihood of being gay.
( Robert M. Sapolsky )
[ Behave: The Biology of Humans ]
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