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If you'll pardon me being a pointy-headed scientist, I figure at the hormonal level level the body senses a majority of population other fertile (pre-menopausal) women via pheromones, and wants to be prepared for the possible opportunity to reproduce. If one woman gets pregnant first, there's a chance that the number of available men will drop, so it makes sense from a reproductive biology point of view to sync up menstrual cycles so as to compete on a level playing field.
The alternative is to have Alice in the next office start ovulating first and get her sexy on become Carol has become fertile, thus possibly depriving Carol of Bob's paternal involvement.
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