From the Folks Who Gave Us the Judaswiege

Scientific American: “A new German study, however, has found that, when practiced correctly, a method of periodic abstinence known as the sympto-thermal method (STM) leads to an unintended pregnancy rate of only 0.6 percent annually. This rate is comparable with that of unintended pregnancies in women who use birth control pills, the most popular method of contraception in the U.S.”

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