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My guess would be that they wear and wash reusable pads. There are modern versions of these, too! Thinx is the big name brand.

Either that or they don’t use anything. Not to get too personal, but it’s not always necessary to use something aside from regular undergarments.

I read menstruation cups are encouraged in poor countries where women can't afford disposable pads, maybe that?

One traditional solution is cattail fluff.

They could just take birth control.