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UPDATE: Oops. Turns out this dude’s post was satire, posted to a Facebook group mocking mansplainers.
By David Futrelle
More misogynatomy for your misogynatomy files! I don’t quite know how the British tabloids (The Sun, The Mirror, Metro UK) got to this story before I did but STOP THE PRESSES, there’s a weird angry dude on Facebook who thinks cis women get periods because cavewomen didn’t eat meat. No, really.
I was going to try to summarize his, er, logic here but I honestly can’t, so let’s just let him explain.

You got that, vagina-havers? You get periods because WE HUNTED THE MAMMOTH BUT APPARENTLY DIDN’T SHARE ANY WITH YOU.
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H/T — r/BadWomensAnatomy