Ovulatory cycles will tend to be regular, and often around twenty-eight days. However, not all women have regular cycles, and if an ovary fires off sooner or later than expected, the first a couple may know about it is the anxious wait for an overdue period.
This method, like other periodic abstinence variations, relies on the ovaries and sperm behaving in a predictable and sporting manner. It is hoped that ovulation will take place mid-cycle, and the egg will expire after two to three days, and that sperm have a shelf life of three to five days. Unfortunately, these players sometimes change the rules in the middle of the game. There is a multitude of different forces which play a part in regulating ovulation.
Basically, according to the ‘calendar method’, intercourse should not take place for about four days prior to, and six days after ovulation. Assuming a 28-day cycle, ovulation would normally occur on day 14 (fourteen days before the start of the period). Therefore, no intercourse from day 10 to day 20, at least.
A woman could work our for her own cycle, by keeping a menstrual calendar for a few months, when her usual ovulation day is, and abstain accordingly.
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