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A member asked:
How long after ejaculation does it take for any left over semen to clear the urethra?
A doctor has provided 1 answer
About 5 hrs: One study showed that after 5 hours sperm were no longer detected in post-ejaculatory urine. (https://www.ncbi.nlm.nih.gov/pubmed/19889505) The conclusion as to whether sperm findings greater than 5 hours after ejaculation are improbable needs to be confirmed via further investigations. I wish you well with your health!
Answered 8/9/2019
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