I also believe that with the "menstrual synchrony", many females would mostly remember when their periods coincide with other close females, rather than when they don't. I mean, I remember when my sister and I have had periods around the same time, but they are always different lengths, like we start on the same day once, her period is finished in 3 days, a week later and mine is still only easing off.
I believe that the menstrual synchrony is more likely due to coincidence than underlying psychological reasons, since there are many studies contradicting it also. Plus, the huge variation between the cycles at home are vast; that is my mum having no periods, my sister having regular three day long periods approximately every month, and then myself, getting two to three periods a month lasting anywhere from three to fourteen days (I have had one period though that lasted just short of four weeks).
Comment