Basic feminine hygiene requires water. Guess what is rationed in space? Imagine spending 8 months in what smells like an uncleaned fish tank.
And by month 3 they will have synchronised their cycles too... if they last that long.
Remember the female astronaut on the ISS that tried to create an emergency on the station by making a leak so they would bring her home? Like there were rockets just sitting around on the pads waiting, like an Uber.
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