Menstrual synchrony
Strassmann argued menstrual synchrony defined as menstruation overlap should be quite common. For example, the expected difference by chance between two women with 28-day cycles—which is approximately the average length of menstrual cycles of women at the age —is 7 days. Considering that the mean duration of menses is 5 days and the range is 2 to 7 days, the probability of menstruation overlap by chance should be high.
Miscarriage
Some health organizations recommend that sexual activity be delayed after the miscarriage. The menstrual cycle should resume after about three to four months. Women report that they were dissatisfied with the care they received from physicians and nurses.