Subject: Why do women menstruate at the same time?

It's known for a long time that the menstruationcycle of women who 
live close to eachother tend to be synchroon after a while. Today 
I've read that it's probably caused by a certain molecule (called 
fero...) that is released by women at a certain stage of their 
menstruationcycle and received by a little organ at the bottom of the 
septum of the nose. My question is what the function of this 
mechanism is.

Re: Why do women menstruate at the same time?