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    Evidence for Assortative Mating on Digit Ratio (2d:4d), a Biomarker for Prenatal Androgen Exposure.Martin Voracek, Stefan G. Dressler & John T. Manning - 2007 - Journal of Biosocial Science 39 (4):599-612.
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  2.  58
    The Second to Fourth Digit Ratio, Sociosexuality, and Offspring Sex Ratio.Bernhard Fink, John T. Manning & Nick Neave - 2005 - Behavioral and Brain Sciences 28 (2):283-284.
    Previous research has suggested that offspring sex ratio may be influenced by the actions of prenatal sex steroids, principally androgens. The relative length of the second (index finger) to the fourth digit (ring finger) has been reported to be a proxy to prenatal testosterone levels. This trait is sexually dimorphic, such that males display a significantly lower 2D:4D ratio (indicating higher testosterone exposure), and this dimorphism appears robust across different populations. We suggest that digit ratio (2D:4D) may form a useful (...)
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    Low Fluctuating Asymmetry (FA) and Short-Term Benefits in Fertility?John T. Manning & Alex R. Gage - 2000 - Behavioral and Brain Sciences 23 (4):610-611.
    Preference for partners with low fluctuating asymmetry (FA) may produce “good gene” benefits. However, Gangestad & Simpson's analysis does not exclude immediate benefits of fertility. Low FA is related to fertility in men and women. Short-term changes in FA are correlated with fertility in women. It is not known whether temporal fluctuations in the FA of men are related to short-term fertility status.
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