After a vasectomy, most men will not experience any significant changes in their sexual function. This includes maintaining the same level of libido, the ability to have an erection, and sensation during sex. It’s important to note that immediately after a vasectomy, there may still be sperm present in the semen, so another form of contraception should be used until a semen analysis confirms the absence of sperm. However, remember that vasectomies do not protect against sexually transmitted infections (STIs).