Do Women Really Sync Their Period Cycles When They Spend A Lot Of Time Together?

“Still, anecdotally, we see this all the time,” says Alyssa Dweck, M.D., who points out that women who cohabit often have similar diet, exercise, and sleep behaviors—all of which can affect cycles.

RELATED: 7 Things Your Ob-Gyn Won’t Tell You…But Really Wants To

Brush up on these vagina do’s and don’ts: 

We say: Myth or no, the feelings of sisterhood that come with it are real.