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Um, I don't believe the effectiveness of birth control measures is calculated in the fashion mentioned above. If it were then the average condom using college student would have several children by graduation.
I believe it is the risk of getting pregnant over a one year period using that particular method, or something to that effect.
I do know that condoms are extremely effective if used properly, but that most people end up becoming somewhat complacent (god knows I do when I have to use those horrible things) and start taking shortcuts or doing things that increase the risk of pregnancy.
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"Socialism is a philosophy of failure, the creed of ignorance, and the gospel of envy, its inherent virtue is the equal sharing of misery." - Winston Churchill
"All men dream: but not equally. Those who dream by night in the dusty recesses of their minds wake in the day to find that it was vanity: but the dreamers of the day are dangerous men, for they may act out their dream with open eyes, to make it possible." Seven Pillars of Wisdom, T.E. Lawrence
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