How soon after a vasectomy is it okay to have unprotected intercourse?
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There is a large degree of variability in the length of time and number of ejaculations to attain azoospermia after a vasectomy. It appears that azoospermia is achieved in 80% of men after an average of 3-4 months and a mean of 20-24 ejaculations (SOR: B, systematic review of low-quality trials and consensus guideline).
Evidence Based Practice 15(12): 15.