Women do not synchronize their menstrual cycles

  title={Women do not synchronize their menstrual cycles},
  author={Zhengwei Yang and Jeffrey C. Schank},
  journal={Human Nature},
It is widely believed that women who live together or who are close friends synchronize their menstrual cycles. We reexamined this phenomenon in two ways. First, we collected data on menstrual cycles from 186 Chinese women living in dorms for over a year. We found that women living in groups did not synchronize their cycles. Second, we reviewed the first study reporting menstrual synchrony. We found that group synchrony in that study was at the level of chance. We then show that cycle… 

A preliminary investigation of synchronous pregnancies in women

Abstract Menstrual synchrony is when the menstrual cycles of friends or family members coincide, such that women conform to the same cycle. In this paper, we propose for the existence of synchronous

Do human menstrual-cycle pheromones exist?

Research over the past 15 years indicates, contrary to earlier results, that women do not synchronize their menstrual cycles, and it follows that that there are no pheromones that modulate the length of menstrual cycles.

Menstrual synchrony: Fact or artifact?

Results of a study conducted over five consecutive months in Polish student dormitories provide further evidence that women do not synchronize their menstrual cycles.

Do non-human primates synchronise their menstrual cycles? A test in mandrills

Demystifying Menstrual Synchrony: Women's Subjective Beliefs About Bleeding in Tandem With Other Women

Despite the empirical uncertainty about the existence of menstrual synchrony (i.e., the phenomenon where some women's menstrual cycles synchronize when they live in close proximity with one another),

Cycling Together: Menstrual Synchrony as a Projection of Gendered Solidarity

Though researchers have hotly debated the phenomenon of menstrual synchrony—women menstruating in tandem when living in close quarters with one another—no conclusive evidence has proven or disproven

The Curse: Popular Histories and Cultural Knowledge

This chapter explores the contemporary vernacular knowledge about menstruation—what might otherwise be called ‘folklore’—that was reported by my respondents. At the same time, I shall place it in

Testing socially mediated estrous synchrony or asynchrony in wild baboons

It is concluded that socially mediated synchrony or asynchrony is unlikely to play a significant role in structuring social groups in baboons because when there are more females simultaneously in estrus, even a dominant male is less able to defend them from other males.

Endocrinology of human female sexuality, mating, and reproductive behavior



Menstrual synchrony in female couples

Menstrual synchrony under optimal conditions: Bedouin families.

Menstrual data were collected prospectively for 3 months from 27 Bedouin nuclear families living under conditions optimally conducive for synchrony: a highly sexually segregated society, standard living conditions, and minimal use of oral contraceptives.

Menstrual synchrony in a sample of working women

Menstrual-cycle synchrony: problems and new directions for research.

  • J. Schank
  • Psychology
    Journal of comparative psychology
  • 2001
The author analyzes their new methodology and presents 2 simulation studies that demonstrate how biases and errors can produce synchrony as an artifact and suggests that synchrony may be a biological state to be avoided and that cycle variability may facilitate female mate choice.

Menstrual synchrony: awareness and subjective experiences

Menstrual synchrony occurs when the time difference between the onsets of menstruation of two or more women shifts such that they become closer. The aim of this study was to examine women's awareness

Multiple influences on menstrual synchrony: Kibbutz roommates, their best friends, and their mothers

  • L. WellerA. Weller
  • Psychology
    American journal of human biology : the official journal of the Human Biology Council
  • 1993
A pheromonal, and not an environmental, explanation of menstrual synchrony is supported, which was found between roommates and between best friends, but not between mothers and daughters.

No evidence for menstrual synchrony in lesbian couples

Menstrual Synchrony Under Optimal Conditions: Bedouin Families

To investigate menstrual synchrony a 3-month prospective study was conducted among 27 Bedouin nuclear families from northern Israel living under 4 conditions optimally conducive for the convergence