Vasectomy only stops the sperm from reaching your semen, it does not stop your semen, alter your penis, testicles or ejaculations. It does not have an effect on the production of testosterone and does not impact your ability to perform sexually, your male characteristics or sex drive. Many couples report an improvement in their sex life, as they are more relaxed once the fear of pregnancy is gone. There is no increased risk of testicular or prostate cancer with a vasectomy.