If I ejaculate warm sperm/semen and then run it down cold water and it becomes fairly cold (below room temprature), would it be dead by the time its cold?
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Cold sperm!
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Probably.
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I'm not sure how long it would take before it was safely dead. You can freeze sperm in liquid nitrogen, defrost it, and use it to get pregnant. Liquid nitrogen is pretty cold.
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Yes, I think cooling it down, by slowing the spermatazoa down, may actually lengthen their lives. They have only a limited amount of energy with them and they die through using it up.
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Well liquid nitrogen is VERY COLD freezing it almost instantly, im pretty sure thats why it lives i think.