There are many interesting theories concerning women’s mense cycles. One of my favorites is the ancient observation that the average woman’s cycle is very close to the lunar cycle. Naturally, this was believed to prove that women’s cycles and their emotions were affected by the moon. It has become known as “The Lunar Effect”, and has been a cornerstone of women’s biology and psychology in Ayurvedic Medicine for 5,000 years (16 pages, pdf).
In order to set this idea into western medical science once and for all, Albert L. Lieber, MD., published scientific evidence to support this in his 1978 book, The Lunar Effect: Biological Tides and Human Emotions
Here is a very convincing opposing opinion from academia (3 pages, online reading).
However, the Lunar Effect is still echoed in legitimate sites, especially those concerning women’s biology. (2 pages, online reading).
Another theory that I find interesting is the idea that, if women live together in close quarters for approximately 90 days—or three menstrual cycles—their mense cycles will synchronize. This is called Menstrual Synchrony and was first described by Harvard associate professor of psychology, Martha K. McClintock, in a paper published in the scientific journal, Nature Magazine in 1971 under the title, Menstrual Synchrony and Suppression (2 pages, pdf).
What became known as the McClintock Effect, caught fire on every campus in the US during the height of the Second Wave of Feminism, was echoed by our professors. (And, when combined with the Lunar Effect, it further mystified women in the minds of young men such as myself. LOL. And we didn’t need any help in that department, trust me.)
Here is the opposing academic argument (15 pages, pdf)
Here is the current status of the McClintock Effect
I just thought you might find these things as interesting as I do, dopeguru.