Re: how long human sperm can live outside body in polyurethane condom?

How long can human sperm live after intercourse in an inert polyurethane 
condom outside body?

If the polyurethane has been manufactured in such a way that it is non-
toxic (they are not all non-toxic) then most sperm within the ejaculate 
can live between 8 to 24 hours depending on (1) the components of that 
male’s accessory sex glands (fluid from seminal vesicle and prostate 
glands) and (2) the quality of that male’s spermatozoa in that particular 
ejaculate.  The glandular fluids have things that are both helpful and 
harmful to sperm survival partly because the ejaculate is made to be 
deposited into the vagina and do well in the female reproductive track 
environment at core body temperature (370 C) and not in an inert 
polyurethane condom at room temperature (approximately 240 C).  We see a 
lot of variance within the male population when evaluating semen samples 
in the lab so that is why my answer is quite broad.  If the sperm cells 
are separated from the ejaculate and then resuspended in a culture medium 
made specifically for sperm outside the body, the longevity can be 
extended to several days for some men.