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well sperm production can be affected by temp. yes, generally the cold increases it..hints why a cock is further away from the body inorder to be a few degrees colder than the rest of the body...
don't worry you just made some.

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do you even know where/how sperm is produced? or anything about the male anatomy?

to actually answer the posters question, it is only temporary.  it'd only become permanent if you sat in a hot tub or on seat heaters for a long period of time every day for a few years. i wouldn't worry about it.