Finger-length ratio may be guide to penis length

Many studies have suggested that the ratio of a man's index-finger length and ring-finger length is tied to prenatal exposure to sex <a class="taxInlineTagLink" id="HHA000030" title="Hormones and Metabolism" href="/topic/health/human-body/hormones-metabolism-HHA000030.topic">hormones</a>. Now researchers have found that the lower the ratio,  the longer the penis. Such findings have more impact than might be readily apparent, offering a way to study prenatal development.

( Allen J. Schaben / Los Angeles Times )

Many studies have suggested that the ratio of a man's index-finger length and ring-finger length is tied to prenatal exposure to sex hormones. Now researchers have found that the lower the ratio,  the longer the penis. Such findings have more impact than might be readily apparent, offering a way to study prenatal development.

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