Menstrual synchrony by chance when there is menstrual cycle variability. Yang and Schank argued that when there is cycle variability (i.e., either women have irregular cycles, have cycles of different frequencies, or both), most women will have the opportunity to experience synchrony even though it is a result of cycle variability and not a result of a mechanism such as the exchange of pheromones. For example, consider two women A and B. Suppose A has menstrual cycles that are 28 days long and B has cycles that are 30 days long. Suppose further that when A and B become close friends, B
Menstrual leave employ such woman on days of the menstrual period." While Japanese law requires that a woman going through especially difficult menstruation be allowed to take leave, it does not require companies to provide paid leave or extra pay for women who choose to work during menstruation. In South Korea, not only are female employees entitled to menstrual leave according to the Article 71 of the Labour Standards Law, but they are also ensured additional pay if they do not take the menstrual leave that they are entitled to. In Taiwan, the Act of Gender Equality in Employment gives women three