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Actually, I have no idea. I just found it on the interwebs and stole it.
I took a peek at the site, and they say themselves that it is only 4% fail rate if the couples ALWAYS do to correctly and there is a near 30% failure rate if you mostly do it right.
Big difference and a lot that can go wrong if the guy doesn`t know his body that well or shoots off in her when he IS finished..
So every 100 times I have sex, I`m going to have 2 pregnancies. Dammit all.
Suck on that Cajun247