Why is this?!
Question:
Why is this?
when 2 women of menstruating years live together or work together that we roughly get our periods at roughly the same time? i've always wondered why?
Answers:
It is well known that women who live in close quarters with each other tend to
synchronize their menstrual cycles. What is not known so well is the exact
mechanism by which this occurs. The best idea is that there must be a small
molecule that acts as a pheromone. The idea is that it stimulates the lining of
the nose (like any other molecule which transmits smell information) which in
turn sends a chemical message to the brain. The brain, in turn, sends its
hormone messages to the ovaries and uterus, thereby changing the cycle.
Why this mechanism evolved in the first place is a difficult question. It
probably had something to do with keeping all the women of a social group or
clan on the same cycle, maybe for child-rearing purposes.