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I am so going to find the study I read over last semster during reproductive bio. It made the claim that with very reliable menstrual cycles, a good knowledge of when ovulation is going to occur and the will to abstain during inappropriate times of the month (particularly the 5 days before and after ovulation) that "withdrawal" could have up to a 90% effectivness in preventing pregnancy. The reality of getting someone pregnant is that there are times when she just can't get pregnant even if you ejaculate inside of her. I'm not saying use it, more of a "standard" to compare other contraceptives against. I think the real lesson here is education, this is too risky a thing to guess with, read, talk to your docter, her doctor and her OB/GYN.
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The advantage law is the best law in rugby, because it lets you ignore all the others for the good of the game.
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