The idea that if women room together (e.g., as college roommates), pheromones will cause their menstrual cycles to eventually align:

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The idea that women's menstrual cycles may synchronize when they live together, known as the McClintock effect, has received mixed support from scientific research. Some studies suggest there might be some synchronization due to pheromonal or social cues, while others have found no significant evidence to support this phenomenon, leading to ongoing debate and research in the scientific community.

The Idea That If Women Room Together (E