So one sperm says to the other "how long until we're in the fallopian tube?" and the other says "beats me, I think we just passed the esophagus." Sorry, couldn't resist.
The answer is that you probably have a better chance of being struck by lightning, and the question, is why isn't she on birth control if you are so worried?
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"Religion is the one area of our discourse in which it is considered noble to pretend to be certain about things no human being could possibly be certain about"
--Sam Harris
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