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J Pers Soc Psychol. 2003 Jul;85(1):179-88.

Are 2D:4D finger-length ratios related to sexual orientation? Yes for men, no for women.

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  • 1Department of Psychology, California State University, Fullerton 92834, USA. rlippa@fullerton.edu

Abstract

The ratio of index and ring finger lengths (2D:4D) is thought to be a marker of prenatal androgen exposure. In a sample of over 2,000 participants, men had significantly lower 2D:4D ratios than women (d = .36 and .23 for right and left hands, respectively), and these results were consistent across ethnic groups. Heterosexual men had significantly lower (more male typical) 2D:4D ratios than gay men (d = .32 and .31 for right and left hands, respectively), and these results tended to be consistent across ethnic groups. Heterosexual and lesbian women showed no significant differences in 2D:4D ratios, after ethnicity was taken into account. The current findings add to evidence that prenatal hormonal factors may be linked to men's sexual orientation.

PMID:
12872893
[PubMed - indexed for MEDLINE]
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