Why do women's periods sync up?

Follow-up studies suggested pheromones were responsible and that “menstrual synchrony” (the technical term for syncing) might be just the tip of the iceberg: It’s possible periods and ovulation could be socially regulated throughout a woman’s lifespan, from puberty to pregnancy and everywhere in between. read more

If you've ever lived in a house full of women, you'll be aware of the hormonal chaos that can erupt once a month. Because as if one period wasn't bad enough, we girls tend to sync up, meaning there are a lot of painters in all at the same time. read more