Do Menstrual Cycles Really Sync Up?

The video explores the concept of menstrual synchrony, starting with McClintock's 1971 study suggesting that women's menstrual cycles sync when they spend time together. The study's findings, known as the McClintock effect, were initially attributed to pheromones. However, subsequent research in both animals and humans has been inconclusive, with some studies failing to replicate the results. Critiques of McClintock's methodology and statistical analysis have also emerged. The video concludes that menstrual synchrony may be more about psychological perception than scientific fact, emphasizing the importance of rigorous scientific methods.

What are pheromones and how are they hypothesized to relate to menstrual synchrony?

What challenges have researchers faced in proving the existence of menstrual synchrony?