During the three experiments, some 40 heterosexual women were shown a set of photographs of 80 men’s faces, all with the same expression.
Researchers found women were remarkably adept in being able to spot the gay and straight men.
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But in a similar experiment using photographs of gay and straight women, they were less able to differentiate.
The study, by psychologists from the University of Toronto, then compared the results to the women’s cycles and found those at their most fertile had the most accurate male ‘gaydar’.
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