Also, it was found to be 1.010 (right hand) and. Michael Peters is Professor of Psychology at the University of Guelph, Ontario, Canada. The 2D:4D ratios of the males were found to be 0.991 and 0.999 mm for the right and left hands, respectively. John Manning is Professor of Psychology at the University of Central Lancashire, and specialises in digit ratios and associated performance.Īndrew Churchill is a senior lecturer, also at the University of Central Lancashire. He is a psychology researcher at University College London. Stian Reimers was lead scientific advisor on the Sex ID project. Differences in 2D:4D ratio between gay and straight men were strongest in whites, and there was no evidence of such a difference among black or Chinese participants. This mean's the jury's still out," Mannings says. "There was a trend for lesbians to have lower digit ratios, suggesting more testosterone exposure, but this was not statistically significant. There was no significant difference in digit ratio between lesbians and straight women. It has taken a survey this size to investigate the issue fully, partly because the effect is so small – you need to average over a lot of people to see it." "There has been a lot of discussion about whether digit ratios and sexual orientation are connected. So this result suggests a link between the hormones a baby is exposed to in the womb and their sexual orientation in adulthood," Manning says. "We can be pretty sure from a large number of human and animal studies that digit ratios are affected by prenatal testosterone exposure. Gay white men had larger 2D:4D ratios than straight white men, suggesting that sexual orientation may be influenced by prenatal testosterone levels. Men, on average, had a smaller 2D:4D ratio than women, reflecting the fact that male foetuses are exposed to more testosterone in the womb than female foetuses are. The 2D:4D ratio is thought to be affected by the amount of testosterone a person is exposed to in the womb. They got participants to measure the length of their index and ring fingers and computed the ratio between the length of their index fingers and ring fingers – their second to fourth digit ratio, or '2D:4D ratio'. My colleague's research suggests that the relative length of a person's fingers is associated with their sex and their sexual orientation. Their findings were published in the April 2007 issue of the Archives of Sexual Behavior. Sex ID participants were asked to measure their fingers.ĭr Stian Reimers summarises Professor John Manning, Dr Andrew Churchill and Professor Michael Peters's analysis of data from the BBC web experiment, Sex ID, for which they were all scientific consultants.
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