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Yes. Although a man may have intercourse two or three days after the procedure if it is comfortable, a vasectomy is not immediately effective. The recommendations are for back-up methods to be used for 12 weeks following vasectomy or at least 20 ejaculations. Where programmatically feasible, a semen analysis should be performed at that time to check that the semen no longer contains sperm.
It is important to recognize that a vasectomized man may still be at risk of acquiring or transmitting STDs and may need to use a back-up method (e.g., condoms) to protect himself and his partner(s).
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It may take several months for the vas to clear the sperm contained in it at the time of vasectomy. This time varies from man to man. Therefore a back-up method for pregnancy prevention (e.g., condoms, Depo Provera® for partner) will need to be used for at least 12 weeks or 20 ejaculations.
- Brownlee H, Tibbels C. Vasectomy. Journal of Family Practice 1983;16(2):279-84.
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