I didn't end up asking them this question because:
a) The question itself has a lot of historical baggage;
b) The answer is pretty boring.
But since people were genuinely curious, I decided to answer it here.
First, a little history. In the early days of space flight, menstruation was part of the argument for why women shouldn't become astronauts.
If I could never get my period again that'd be cool with me.