Sponges are the stupidest things in the world to use as "birth control". I'm surprised they report up to 91% success.
It's got holes in it! It's completely porous!
In my opinion, you're asking to get knocked up if you use a sponge. They're
so not safe.
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Originally Posted by politicophile
A 91% success rate sounds good until you realize that means the sponge fails one time out of every nine.
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This is a common, incorrect way to interpret success rate- otherwise, it would mean you get pregnant every 9 times you have sex. That is not what it means. It means that EVERY time you have sex, you have a 91% success rate. It's the same with condoms- 99% does not mean you'll risk a kid every 100th time you have sex, it means EVERY time you have sex, you have a 99% success rate.