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i really don't know for sure, i do know that the heat if you use a heating pad or warm water, will kill the sperm, but not sure about regular pumping,  i know some guys here will be able to shed more light on this<br>

As far as I know from my mammalian reproduction courses at university, what happens during pumping should not have any longterm effect on sterility.  <br>If your sperm are intolerant to heat then pumping with warm water or dry heat could reduce your viable sperm count, causing some reproductive problems. <br>