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Menstrual Synchrony Essays -- Biology Essays Research Papers

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Menstrual Synchrony

Generations of women have noticed it: you and your sister, or your roommate, or lover, or mom, get your periods at the same time. It doesn't always happen, but it catches the attention when it does. Female rats living in the same air space ovulate at the same time. Menstruation in monkeys synchronizes with the full moon (7). So is it all in our heads, or is the same pattern present in humans?

The clearest argument against the existence of menstrual synchrony is that since the length of the menstrual cycle varies from person to person (2), two women with different cycle lengths will never synchronize. They may menstruate at the same time, but the next month they will be a little different, the next month more different, and so on. By this argument, synchrony is simply a myth.

I cannot believe this argument, since it assumes that menstruation can be graphed and analyzed like a sine wave. Human bodies rarely adhere to perfectly timed schedules.

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