Sperm doest die when it hits the air...come on think on that one for just a few minutes and one will realize that. If sperm died when it hit the air then those that have to go through IVF,IUI,and such wouldnt be able to get pregnatn because their partner does have to jack off into a cup so they can use his semen. Also sperm donations wouldnt be possible and the list goes on.
Sperm can live about four hours outside both the male and female body.
As for how long it can stay in the urethera that depends. If a guy urinates that tends to flush things out.
Just be smart and make your parnter wear a condom instead of trying to play around without protection.
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Married 3/25/95
DS 13 yr
DS 8 yr (3+ yrs ttc)
TTC #3 since 01/02
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sperm and precum 
Linear Mode
