The incidence of “non-paternity” (when a child turns out to have a different father than they thought they did) is estimated to be somewhere around 10%. And now that over-the-counter paternity tests are available, it is becoming easier to find out if your are your father's child. Their sale is an "indirect but unavoidable admission of infidelity within a society." But is this infidelity depravity, or simply biology?

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