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Fear Not the Menstruators

October 20, 2011

Fear Not the Menstruators

The Synchronization of Menstrual Cycles


We all have this fear of menstruating women banning together and terrorizing the world like a bad zombie movie.  Same blood, grumbles, and glazed over look.  I have always been wary of living with women for fear of my body synchronizing to someone else’s.  What happens if I move in with a women who spends seven days a month in bed watching season after season of Sex and the City!?  Does my body just decide to copy that?  Or do we compromise with a fair average of our period duration, pain, and heaviness?  Fortunately, you cannot catch a bad period like you can a cold!

No studies have proven the phenomenon of synchronization of periods. Martha McClintock of the University of Chicago performed the first study of this issue in 1971. The results, while they supported the idea of synchronization, are highly questionable due to insufficient sample size (135 college females) and a limited number of gathered data (she recorded period start dates only three times within twelve months). Following tests show both synchronization and the lack of within close living females.

Womenʼs cycles have varying length are dependent on many factors including weight and diet. Because each woman has a unique length and flow, menstrual periods can never truly be synchronized. However, according to Scientific American, “Periods can randomly phase in and out of synchrony over the months as their cycles diverge and converge”.

Studies which support synchronization point to one specific hormone as a cause in the change of menstrual timing. Luteinizing hormone (LH) controls the timing of ovulation and the cycle length. A Japanese study found that the inhalation

compounds released by menstruating women increases the surges of LH in non-menstrual women. LH in females triggers the production of progesterone and in males it

stimulates the production of testosterone. It would stand to reason that if women produce more progesterone after inhaling these menstrual compounds, men too would produce more testosterone. So that is why, even when my period makes me feel like a dirty sock, I get more male attention! What a cruel world.

Yes, people and their hormones affect you. But not in the horror story way that we think of when we imagine a dorm full of menstruating women.










Scientific American. Do Women Who Live Together Menstruate Together?. Anna Gosline. Dec 7 2007.

2 Comments leave one →
  1. psnapp permalink
    October 20, 2011 3:10 pm

    Very interesting these “inhalation” compounds. Is this about some odor? Is it sub-threshold in the sense that our senses gather olfactory information yet the concentration is insufficient to register to conscious awareness?

    oh and would like to ask another question …several really

    S Q U I R T I N G
    Can women really do this?
    How common is squirting?
    What are they squirting?
    What is the biological function?
    Why is this phenom spoken of in popular culture only recently?

    I’m thinking it could be a myth or some trick photography or stunt.


    • October 23, 2011 7:03 pm

      Dear P’napp,
      These inhalation compounds are not actual odors. They are more like pheromones. They are subtle and as you said sub-threshold. They affect how we react to each other even while we may not notice their presence.

      As for squirting, stay tuned and I will answer all your questions soon.

      -The Sexual Operator

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