Why do womens' mentrual period come at the same time when they spend a great deal of time together?

Answers:

How do you determine whether you have a starchy flow or a light one?

Because women give off a chemical around the time of their period and it causes them to be aroud indistinguishable time..

Hi. I am 14 years old and haven't started my interval yet, i am the singular one out of freinds who hasnt started.

interesting question, I would resembling to know an answer for this as well...

I have a misscarige 6 years ago i dident see a doctor can i still have children and will my tubes be clear?

who is "they"?

Am i pregnant?

because their hormones are almost one and the same.

I wan increase my sexual?

This goes fund to prehistoric times. The woman's instinct is to keep her man's gene all to herself. If she is have her period, consequently the instinct is to fear that the man will move about to someone else to have sex. So, women produce pheromones that other women's chemistries respond to. The pheromones are simply saying, "If I'm on my interval, will you be on your period, too, so that my man won't be capable of take his DNA somewhere else, and it'll work with your man too." The same item happens beside chimps and other primates.

Why are my lips in that sore?

cause they all travel out to drink together at the same time lol.Really I don't know

What is a possible form consequence for sexually active teens?

it's in recent times a coinsidence. there is no hormone or doesn`t matter what that guy was maxim. thats bs.