Abstinance: Abstinence is the only 100 % effective natural method of birth control. Conception has occurred on any day of a womans cycle, including during menses, so timed intercourse is not dependable.The semen contain sperm at all points during sex, so the withdrawal method is also unreliable.Timing and withdrawal reduce pregnancy risk some but you must plan for them to fail eventually.
Answered 4/1/2014
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