Why do periods synchronise?

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Why do periods synchronise?
« on: 20/11/2011 17:01:02 »
Engelina asked the Naked Scientists:
Hi Chris

Hope you are ok. I love listening to your shows with Redi.

There is something that puzzles me and my sister,we share a bed and somehow, whenever I start with my mentrual period she also does the next day or visa versa.  It's been like that for a long time,but when we are apart it does not happen. Is there an explanation for this?

Kind regards

What do you think?
« Last Edit: 20/11/2011 17:01:02 by _system »