.

Is sperm dead once it reaches the air? Does oxygen kill sperm?

No, this is a myth that many people believe in, but it is not true! Once sperm is DRY it is dead and cannot travel to fertilize an egg. Sperm can live for 3-5 days if it is in a warm, moist environment such as the cervix of a woman. Sperm cannot come back to life once it has dried, even if it is remoistened!

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