Hmmm...
She isn't into evolution theory very much, while I tend to read up on it every so often. So normally you would be wrong.
But in this case, she is the one that I first heard both the facts about synchronizing periods and the risks of hiking while on a period from. (Both of which I got ample confirmation of when I checked up on.)
So..yeah. :-)
Cheers,
Ben
"... I couldn't see how anyone could be educated by this self-propagating system in which people pass exams, teach others to pass exams, but nobody knows anything."
--Richard Feynman