Why do womens periods get into sync

February 28, 2009 12:39pm CST
I'm asking people out there why do womens periods get into sync when thay are in close proximatey. For example, families, mother doughters often have them at the same time, also a group of girls sharing a house at university often have their periods at the same time of the month. Answer me why?
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3 responses
@pickwick (858)
• India
28 Feb 09
Its found in girls hostel too that the roommates have periods almost in sync.This is because of some phereomones released during periods.Pheromones are chemicals produced by the body which shows its effect outside the body on other individuals.
• South Africa
28 Feb 09
I think it's a biological phenomenon - it happens in the workplace too. I've heard that who starts first is determined by perceived rank. Very interesting.
28 Feb 09
I read something about this recently and I'm trying to remember what it said. It was very interesting and it's to do with smell. There's a hormone that we're not consciously aware of, but we smell it and it puts us all in sync. It's referred to as a "scent cue".