How long does sperm live outside?

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How long does sperm live when its out in the open...meaning if i bust on a girls chest, how long will it be till the sperm dies??

Depending on conditions and moisture 1/2 to 4 hours

What if she rubs your cum onto her body, and waits about 5 minutes? doesnt the rubbing kill the sperm? Also, if she sucks off the cum, is it safe to put it back in?

I suppose spreading out the ejaculate will kill off sperm quicker since they are more exposed. Sperm thrive in warm, wet environments. In reply to: Also, if she sucks off the cum, is it safe to put it back in? No. Unprotected sex isn't safe in the first place, but to answer your question more thoroughly all of the seminal fluid does not pass through the urethra right away.

Well if its out of her for more than 10 to 15 minutes or so? Thanks. Sorry for asking in two posts.

Even after 15 minutes you have to worry about precum getting her pregnant.

so, if she spreads it out, the dried cum on her hands cannot get her pregnant if she touches herself?

If the cum is dried out it's pretty safe to say the sperm is dead..... but touching herself with crusty cum fingers can be a hygiene problem. lolThough, anything is possible... perhaps the glob of cum is dried on the outside and wet in the middle then she gets pregnant.

Thanks alot dude...