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| Digit ratio (2D:4D) in homosexual and heterosexual men from Austria. |
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| TS-Si Research Service | |||||
| Friday, 06 November 2009 23:33 | |||||
Digit ratio (2D:4D) in homosexual and heterosexual men from Austria. Arch Sex Behav. 2005 Jun;34(3):335-40 Authors: Voracek M, Manning JT, Ponocny I Neurohormonal theories of sexual orientation emphasize the organizational effects of testosterone on the developing brain. A recent suggestion, that the ratio of the length of the 2nd and 4th digits (2D:4D) is negatively correlated with prenatal testosterone, has led to a number of studies of 2D:4D in homosexual and heterosexual men and women. The results have been mixed. In comparison to heterosexual men, mean 2D:4D in gay men has been reported to be hypermasculinized (lower 2D:4D), hypomasculinized (higher 2D:4D), or to show no significant difference. Here, we report mean 2D:4D in Austrian homosexual and heterosexual men. We found no significant difference between means for homosexual and heterosexual 2D:4D, with values for both falling between 0.96 to 0.97. There are now 6 reports of 2D:4D in heterosexual and homosexual men. Considering Caucasian men, the studies from the United States show low heterosexual mean 2D:4D, and homosexual mean 2D:4D is higher or similar to that of heterosexuals. The European studies show high heterosexual mean 2D:4D, and comparisons with homosexuals reveal the latter to have lower or similar mean 2D:4D to that of heterosexuals. We discuss these results in relation to the suggestion that mean 2D:4D in heterosexual men differs across populations but mean 2D:4D in homosexuals shows less geographical variation (the "uniform mean hypothesis"). It is concluded that more data are required to clarify whether or not there is a 2D:4D effect for sexual orientation in men. PMID: 15971016 [PubMed - indexed for MEDLINE]  The TS-Si Research Service consolidates information on research intiatives and findings relevant to individuals who correct the misalignment of their brains and their anatomical sex. The service tracks key scientific and medical developments at every stage of the process — from early consideration of research opportunities and published findings through practical application in clinical settings. Researchers and students from qualifying institutions regularly receive special emailings from TS-Si that consist of abstracts and other materials that support their interest areas. The TS-Si News Service is a collaborative effort by TS-Si.org editors, contributors, and corresponding institutions. The sources can include the cited individuals and organizations, as well as TS-Si.org staff contributions. Articles and news reports do not necessarily convey official positions of TS-Si, its partners, or affiliates. We welcome your comments. Use the form below to leave a public comment or send private correspondence via the TS-Si Contact Page. We will not divulge any personal details or place you on a mailing list without your permission.Posted:                       Add this page to your favorite social bookmarking websites. To create link towards this article on your website, copy and paste the text below in your page. Preview : 
Digit ratio (2D:4D) in homosexual and heterosexual men from Austria. Friday, 06 November 2009
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The TS-Si News Service
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are collaborations of TS-Si officials, staff, contributors, and corresponding institutions. Contents do not necessarily convey official positions of
TS-Si, its partners, or its affiliates. 