A sexy sway of the hips, long-believed to be a sign seduction from women, actually may mean back off, according to a new study.

A woman with a sexy walk is unlikely to be ovulating, which is typically when single women seek out male partners, according to a new Canadian study, French news service AFP reports.

A team at Queen's University in Ontario, Canada, dressed female volunteers in suits which had light reflectors placed on the joints and limbs and filmed them walking in order to analyze their gait. Saliva samples were taken from the women to test their hormone levels.

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Researchers said women who were most fertile walked with smaller hip movements and with their knees closer together. The study published online in advance of publication in the U.S. journal, Archives of Sexual Behavior.

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Forty male volunteers were shown the footage of the women and asked to rate their sex appeal. The men rated the least fertile women as having the sexiest walks.

Despite the baffling results, the researchers said there was no contradiction to the findings because women who are most fertile are much more upfront with their desires to find a mate.