Why Do Human Women Have Monthly Periods?

by Roger Bourke White Jr., copyright September 2019


Why do human women have monthly periods? Why aren't they annual or semiannual like those of most other mammals?

The answer is... to keep men close.

For most mammals the males and females go their own ways most of the time and only get close when the females are "in heat". For humans it is a benefit to have males stay close and help raise children. To help that happen evolution has redesigned women to feel good about having men close-by lots of the time. Feeling constantly sexy helps this to happen, and having monthly periods helps this constantly feeling sexy to happen.



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