The calendar method is reliable because women almost always ovulate on the same day of their cycle each month.

Name: The calendar method is reliable because women almost always ovulate on the same day of their cycle each month.
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The calendar method is not a reliable method of birth control because women's ovulation can vary from month to month, making it difficult to predict the exact day of ovulation. Other factors such as stress, illness, and changes in medication can also affect a woman's ovulation.

The Calendar Method Is Reliable Because Women Almost Always Ovulate