Amazingly, the testicle continues to work perfectly normally after a vasectomy. The testicles’ two main functions are sperm production and testosterone production, and neither is affected by vasectomy. The testicles continue to produce around one hundred million healthy sperm daily, which move out of the testicles, into the epididymis, and then into the part of the vas deferens below the vasectomy site. During a vasectomy reversal, which is often a number of years after the vasectomy, the first procedure done is to open the vas deferens beneath the vasectomy to sample the fluid for sperm. In what many consider to be a miracle of modern medicine, many years after the vasectomy, we often find healthy sperm coming right up to the vasectomy site, ready to cross through the new connection during a vasectomy reversal.