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7. Finger length may indicate penis size

Hold up your right hand. Are your index and ring fingers mismatched? Congratulations, you're more likely than men with matching digits to have a long penis. A smaller ratio between the second and fourth fingers is linked to a longer stretched penis size, researchers report in the Asian Journal of Andrology. The findings go beyond providing a new finger ratio-based pick-up line for men in bars, however; researchers say that a quick look at a man's fingers could reveal his exposure to male hormones in the womb, providing a hint about his risk for hormone-driven diseases like prostate cancer.