Women and Kaka really do have a 'gaydar' and can tell a man's sexuality just by looking at them
Last updated at 11:20 AM on 24th June 2011
It's just plain biology: A woman's need for a mate gives her the instinct to tell a man's sexual orientation
If a woman tells you she can spot a gay man just by looking at him, don't dismiss her claim out of hand.
Scientists say women really do have 'gaydar', which helps them spot whether a man is straight or gay just by looking at his face.
And the instinct is at its strongest when she is at her most fertile and in the mood for romance.
Their findings suggest that a woman's ability to determine whether a potential male partner is straight or gay is linked to the impulse to have children.
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.
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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