Sex can often be resumed within a week after the vasectomy. But it’s important to know that a vasectomy doesn’t work right away. After the procedure, new sperm won’t be able to get into the semen, but there will still be plenty of sperm remaining that takes time to clear. To schedule an appointment for a urological concern, please call METROWEST UROLOGY at (508) 655-4422. Our practice is located at 67 Union St, Suite #308, in Natick. Dr. Kacker runs a small start-up developing new products for male sexual health problems which is now working in partnership with a top 10 pharmaceutical company.