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Tim Harford explains the numbers and statistics in the news and in life

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02/09/2016 GMT

Menstrual Syncing

BBC World Service - More or Less, Menstrual Syncing

Do women’s periods start to synchronise if they spend time together?

It is a commonly held belief that if women spend enough time together, their bodies start to communicate through chemical signals, known as pheromones. Eventually the women’s bodies will start to menstruate at the same time. 

But where does this idea come from? And is it really true? We look at the evidence and wonder – could it be down to chance?

(Photo: Two women. Credit: Eugenio Marongiu/Shutterstock)

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