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Typically, in women, the index finger (second) and ring finger (fourth) have the same length, while in men, the difference is greater, said researchers from the University of New York. Esbad in the United Kingdom.
Previous research has revealed a potential link between prenatal hormone levels and differences in finger length, with people exposed to higher levels of "male" hormones being more likely to have the hands "typical of men".
According to the study published in the journal Archives of Sexual Behavior, men and women are exposed to testosterone, a "male hormone" in the uterus.
The study of identical twins of different baduality revealed that not only was their baduality different, but their hands too.
He examined 18 pairs of binoculars and found that the bad twin had on average more "typical male" hands than his heterobadual sister.
The researchers also looked at 14 pairs of male twins and found that gay twins had a few more "typical men" hands than their heterobadual brother – but the difference between the two was not considered significant.
"Because identical twins, who share 100% of their genes, may differ in their badual orientation, factors other than genetics must take this into account," said Watts Tuesday, who worked at the University of Michigan. study with Gerulf Rieger. Esbad.
"Research suggests that our baduality is determined in the womb and depends on the amount of male hormone to which we are exposed or the way our body reacts to this hormone, people exposed to higher levels of testosterone being more likely to be bibadual or homobadual.
"Because of the link between hormone levels and the difference in finger length, looking at someone's hands might provide a clue to their baduality," Watts said.
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