Sorry folks: Menstrual syncing is not a thing.
Sorry folks: Menstrual syncing is not a thing. Daniel Berehulak/Getty Images

The latest episode of the public radio show/podcast This American Life takes on an issue that is near and dear to many uterui: menstrual syncing.

If you have an uterus and have spent large amounts of time in groups of women, you've probably had the menstrual syncing conversation before. It goes like this: "Are you on your period? I'm on my period! OMG We're synced!" I heard variations on this conversation nearly every month when I worked in a female-run hair salon, and possibly even more when I lived in a house with seven female housemates: "Are you on your period? I'm on my period! OMG We're synced!"

The thing is, we weren't. Despite mounds of anecdotal evidence, and a bunch of flawed studies, menstrual syncing does not exist. If you already believe in menstrual syncing, there's probably nothing I can say to convince you otherwise, but This American Life looks at the evidence for and against, and the evidence is clear: MENSTRUAL SYNCING DOES NOT EXIST. THE LENGTH OF YOUR PERIOD VARIES. IF IT OVERLAPS WITH YOUR GIRLFRIEND'S, IT'S JUST CHANCE.

Listen to the show. It's about more than the myth of menstrual syncing: It's about why we believe the things we do, often (very often) without evidence.