Yeah this is still very much only theory. They are going off female hormones and periods as an indicator. I grew up in a family of all girls. One female is always dominant and will drag along the other women for the ride. This was me growing up and I was always all over the place throwing everyone else off. This could also be the case. You don’t have to be necessarily shedding anything for it to mess up the women around you. But honestly we won’t know until more time goes by and doctors actually start testing people.