Who knows?: Thank you for bringing up this question to professionals. In my lifelong study and practice in urology of 35 yrs, I have never heard any discussion on sperm survival in one's dry hand. I assume you worry about pregnancy from sperm "contamination" and transfer, is it so? If any doubt, just wash hand and dry, and wait for 15-30 minutes before engaging in sexual acts. Or you may take this as project.
Answered 8/13/2018
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