One of the things they told Mr. Clod was he needed to come several times after surgery in order to clear the tubes of any stragglers, before considering himself really sterile. I can't remember how many times they said but I remember thinking it was ridiculously high, maybe 20 or something. Of course I'm sure they rounded up to be on the safe side, but I suspect that this still isn't something you'd be switching on and off all the time.
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