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Have you ever tried to make a baby? It can indeed be done in one go, but many couples require several before it works.

Before people had a (correct) theory of pregnancy, they would not know the best time of the month, which orifice to use, and a bunch of other confounding variables.

When I made my first kid we were mistaken about the best time of the cycle. As soon as I googled it, it worked.




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