Just for fun, I researched the 8th day myth, and could find no medical recognition of that little 'factoid' we JWS were brought up with.
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I think Adam may have been created whole, but circumcised as punishment for following that brazen woman, Eve. It's all her fault. She was probably a - horror of horrors! - feminist. For that one mistake, the poor sot received the worst punishment g-d could think of - loss of sensitivity. Eve was, like all women, a temptress, and essentially, flawed.