2D:4D and Sexually Dimorphic Facial Characteristics

@article{Burriss20072D4DAS,
  title={2D:4D and Sexually Dimorphic Facial Characteristics},
  author={Robert Philip Burriss and Anthony C. Little and Emma C Nelson},
  journal={Archives of Sexual Behavior},
  year={2007},
  volume={36},
  pages={377-384}
}
The second-to-fourth-digit ratio (2D:4D) may be related to prenatal testosterone and estrogen levels and pubertal face growth. Several studies have recently provided evidence that 2D:4D is associated with other-rated facial masculinity and dominance, but not with facialmetric measures of masculinity. We found that localized face shape differences, shown here to be sexually dimorphic and related to ratings of dominance, were associated with direct and indirect measurements of 2D:4D. In this… 
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TLDR
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TLDR
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TLDR
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It is found that heterosexual women had higher (more feminine) left- and right-hand 2D:4D than did lesbians, but there was no difference between heterosexual and gay men.
Testosterone responses to competition in men are related to facial masculinity
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It is demonstrated that, after experimentally determined success in a competitive task, men with more a masculine facial structure show higher levels of circulating testosterone than men with less masculine faces, indicating that a man's facial structure may afford important information about the functioning of his endocrine system.
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