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lovely questions
Sperm die quickly and have mutant problems with heat, like two tails or no dies. Sperm will not mature very well with body temperature and above.
However, sperm will strive well under cooler conditions. They can be kept in colder conditions such as -200 degrees celcius for safe keeping, but will die in hotter conditions like 38 degrees celcius.
Sperm die all the time, they die in your epididemis, vas deferens and urethra, so asking whether sperm die in air is not a valid question. Are you asking if they are aerobic organisms or anaerobic organisms?
Btw, the semen contained with your sperm contains alkaline buffer meaning they can survive acidic conditions (vagina) for a certain period, so they are pretty tough fellas 
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