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Why is a woman’s fertility cycle essentially the same as that of the moon?

Asked by ipso (4481points) November 21st, 2010

Can this really just be a huge coincidence?

Does lunar cycles effect humans gravitationally, like the ocean’s tides? If so, then why are women’s cycles not generally in sync? (Yet women who spend time together can sometimes “sync up” their cycles independent of their history, or the moon cycle.)

Did countless pre-history generations somehow select women with this periodicity, thus altering the genetic proclivity to this?

How else might this be explained?

Inspired by @john65pennington’s question here:
http://www.fluther.com/104561/why-is-there-a-new-blue-moon-today-and-how-did/

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