Experts unpack the common myth of menstruating people’s cycles synchronizing when they’re in close proximity for long enough

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T

o be someone who menstruates means continuously trying to untangle fact from fiction. Is it true that you can’t swim on your period? No. Does the scent of a person menstruating attract bears? Also no.

There is one period rumor I’ve always kind of enjoyed, though: when women are in close proximity for long enough, their menstrual cycles will eventually sync up, also known as “menstrual synchrony”. I’ve had several friends over the years claim that my period had yanked them on to my cycle.