A woman’s voice becomes more attractive when she is most fertile. Scientist recorded women counting from 1 to 10 at four occasions during their menstrual cycle. They replayed the recordings at random to male and female students and asked them to rate the attractiveness of the voices. Both males and females judged these voices to be most attractive if they were recorded during the peak fertility period of the menstrual cycle, and less attractive if they were recorded during non-fertile periods.

It is evident that the sex hormones influence the voice box, or larynx, says researchers. They say the changes in the female voice during peak fertility support the view that women are "different" at that point in the menstrual cycle - in other words, that they experience oestrus.

The fact that men notice the differences in vocal attractiveness suggests that there is a subtle evolutionary battle of the sexes going on, says Gallup: as women evolve ever more efficient ways to conceal fertility - to avoid unwanted attention - men become increasingly sensitive to the tiny changes that do occur.

Geoffrey Miller at the University of New Mexico, Albuquerque, showed last year that women lap dancers earn more tips during their fertile days. "The voice changes might explain some of the shift in lap dancer tip earnings," he says. "Dancers certainly chat with their customers." But Miller points out that there is also evidence that visual attractiveness changes during the menstrual cycle. "Voice quality is unlikely to be the whole story," he says.

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