text: how often do vasectomies fail? i believe the only 2 ways a guy could still impregnate after a vasectomy is if he f*cks unprotected soon after the operation before the pre-existing sperm clears the system, or if the vas deferens fuse back together. follow up question; if there is still a risk of recanalization with traditional vasectomies, why dont surgeons just remove the entire tube instead of a small section? from a ob doctor said that the failure rate is largely due to the patient not following what he must do in order for the vasectomie to work. the man has up to forty fruitful; live ejacts left in him, so he must do alot of mastrabating 40 times to be sure all the potence is gone.  believe it?