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Earlier studies have already documented flirtatious behaviour and changes to body scents believed to be clues to a woman's fertility status.
The latest study, to be published in the Journal of Evolution and Human Behaviour, found that a woman's voice becomes more attractive during her monthly cycle when she is at her most fertile.
Nathan Pipitone and Gordon Gallup of the State University of New York at Albany recorded women counting from 1 to 10 at four occasions during their menstrual cycle.
When it was replayed at random, both males and females judged the women's voices to be most attractive during the peak fertility period.
"The results showed a significant increase in voice attractiveness ratings as the risk of conception increased across the menstrual cycle in naturally cycling women. There was no effect for women using hormonal contraceptives," the researchers were quoted as saying by the New Scientist magazine.
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