How accurate is birth control?
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If by birth control you mean a hormonal method such as the pill, it is 99.9% effective at preventing pregnancy, but it does not prevent the contraction of STDs, so unless you've had your partner tested, a condom is always necessary.
The withdrawal method of birth control is really not very effective, if your friends want added protection, they should use a condom. When used alone, the withdrawal method of birth control is only about 73% effective at preventing pregnancy, compared with the 85% effectiveness of condoms. I don't think that the withdrawal method adds much protection for them, to be honest.
If a girl doesn't take her birth control consistently and correctly (at the same time every day), the effectiveness can be decreased to about 95%.
well birth control is 99.9% accurate. If you use both methods (withdrawal and birth control) you can really be sure you won't get pregnant. If you use only the withdrawal method you have a higher risk of getting pregnant since the pre-c u m has some sperm too.
Withdrawal shouldn't even be considered a precaution. Precum (semen dripping out before actual ejaculation) has plenty of sperm that can impregnate a woman.
When taken every single day at the same time, the Pill is 99.9% effective at preventing pregnancy. The "normal" effectiveness is about 92%, taking into account missed pills, taking them late, etc.
It does nothing to prevent any STD's, though, so I don't think your friends are being too smart by not using condoms. Especially since, judging by the tone of your question, you're probably still in high school.
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