4 Perhaps the popular appeal is the relative simplicity of the measure, and the fact that researchers interested in any number of behavioral or physiological traits correlated with hormone activity have adopted digit ratio as a convenient biomarker for prenatal androgen exposure. 2, 3 Ratios are determined early in development and remain relatively stable thereafter. Digit ratio, most commonly the ratio of the index to ring fingers in humans, is sexually dimorphic (males have lower values than females) with greater differences on their right hand. Now advertized in at least one locale as the ‘sexy ratio' with the caption, ‘Your hands give away your hotness' ( !5794008 accessed ), an online summary of a recent study linking facial attractiveness to the ratio of the index and ring fingers 1 indicates that digit ratio (2D:4D) research has reached mainstream culture.
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