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To answer your question, I highly doubt that those statistics take into account pulling out. I've never heard of a study that did unless that was the main interest.
Can you explain why you think the sponge is so great? I think the reason you don't hear about it much is because it isn't nearly as effective as other options so not many people use it. This should be a big indicator for you that it is a bad idea. There are other options out there that are better, I think you need to do some more research.
Has your girlfriend ever been on hormones? They don't effect everyone negatively, and if she's never tried it she could be missing out on a good option for birth control.
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My life is one of those 'you had to be there' jokes.
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