There are many things that are going on in a woman’s body. Every month women have their menstrual cycle which is their bodies’ way of getting ready for conception. During menstruation, their bodies are simply getting rid of eggs and uterine lining that their body prepared for conception.
There are many other information associated with menstruation and among these is menstrual synchrony. Menstrual synchrony is a theory that the menstrual cycles of women who live together synchronize over time. Since this concept is theory, this means that it is not yet an accepted fact although many studies suggest that this theory is indeed true.
The idea or concept of menstrual synchrony has been observed by a lot of women even before it was given a name. However, it was not until 1971 when an undergraduate named Martha McClintock formally made the first study on menstrual synchrony. Another study was done in 1998 by McClintock and Kathleen Stern to further explore the possibility that the release and reception of women pheromones are the reason why menstrual synchrony happens. Although this study suggests that pheromones for women which, in the study, was collected from the underarms of the women in the study, really have an effect on other women, the results were still not wholly conclusive especially since other studies are done to refute menstrual synchrony.
There were two other known studies that were done on menstrual synchrony. A study of 20 lesbian couples conducted by Weller and Weller showed that in more than half of these couples, the two women had their menstruations within two days of each other. However, another study by Trevathana et al. on 29 lesbian couples showed no evidence of menstrual synchrony.
Many of the criticisms about the studies done by McClintock centered on methodological errors and errors in data collection and mathematical calculations. H. Clyde Wilson of the University of Missouri even made studies with these errors corrected and his studies showed no evidence of menstrual synchrony.
Despite these many conflicting studies on human pheromones, the question of whether human pheromones actually do exist is still unanswered. Still, many human behaviors are such that they are affected by other humans. In other animals, different kinds of pheromones are released for different purposes such as for alarms, sexual attraction, information, and many more. While these chemicals have actually been observed to be excreted by other animals, human pheromones have not been identified and named.