Handedness, birth order, and finger length ratios in self-identified asexual men and women". That a greater proportion of men have shorter index fingers than ring fingers than do women was noted in the scientific literature several times through the late s,  with the statistically significant sex difference in a sample of men and women established by after which time the sex difference appears to have been largely forgotten or ignored. Democratic Debates Politics U. Asian Journal of Andrology. Human Reproduction.
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The level of estrogen in the amniotic fluid is not correlated with higher 2D: Anthropometry Gender Fingers Ratios Testosterone. In other projects Wikimedia Commons.
A day study of men found that men with comparatively longer ring fingers were more likely to laugh, compromise, compliment others and smile.