Hey guys,
Sperm needs a very specific environment to survive. The temperature of the average room is enough to kill it.
As to someone inadvertently getting pregnant, I wouldn't worry. the likelihood is sooo low as to make it a non issue for most situations.
Perhaps if you wiped up sperm with a towel and within about 10 minutes a woman used that spot of that same towel to aggressively dry her vulva... Even then she would have to be at the right point in her cycle.
Basically you are stressing over nothing. Is it possible-Sure it is. Is it likely-HELL NO!
Either way, it's good to be on the safe side, just don't need to go to extremes about it.