Reply #61: They would all have PMS at the same time.

[Silverhair]

It is a known phenomenon that when fetile women live together, their periods tend to become syncronized. In a group marriage of say 4 guys and five women, the guys may have a once a month business trip to take together.

This has interesting implications for small tribes in hunter-gather situations. Maybe strong PMS was a natural selective way of getting the guys off their butts and out hunting.

Ladies, don't get mad at me. We have to sometimes see the lighter side of things.