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Q:

How effective is FAM as a method of birth control?

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If used perfectly every cycle, including abstaining during the fertile phase, the FAM rules have a failure rate of approximately 2% per year. This is considered lower than any barrier method, except the condom, which is also 2%. But unlike other methods of contraception, this method is the most unforgiving, since, if you make a mistake, by definition, it will occur during your most fertile time. So in actual use, failure rates may be higher, depending on the motivation of the couple to adhere to the rules.
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