By ‘natural’ we mean the absence of pills, potions and devices. Several methods are available. They are all best regarded as inefficient for the woman who is determined not to get pregnant, but they are useful for the couple who is not too worried about having another baby or for those who are really meticulous about their use.
In this the body temperature is taken daily, first thing before getting up, by inserting a thermometer into the mouth, rectum or vagina. The result is plotted on a chart. The temperature recorded like this is seen to rise over the two or three days after ovulation to a plateau about o.4°C above the temperature recorded in the early days of the cycle. After the temperature has been at this plateau level for three days intercourse can be resumed. If intercourse is avoided for four days (the longest reasonable life of a sperm in the female reproductive tr,act) before the predicted date of ovulation (as calculated from several months’ charting of your temperature or doing a kit test) and resumed at this later point in the cycle, the method can be reasonably effective.
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