Also known as natural family planning, periodic abstinence
and the rhythm method, this approach entails not having sexual intercourse on the
days of a woman's menstrual cycle when she could become pregnant or using a barrier
method (such as a condom, the diaphragm or a cervical cap) for birth control on
those days.
B ecause a sperm may live in the female's reproductive tract for up to 7 days
and the egg remains fertile for about 24 hours, a woman can get pregnant in a substantial
window of time -- from 7 days before ovulation to 3 days after. Methods to approximate
when a woman is fertile are usually based on the menstrual cycle, changes in cervical
mucus, or changes in body temperature.
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