You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is A couple is advised to use barrier methods after vasectomy till : and explain in detail?
It is imperative that some other contraception should be used for the next three months or 15 ejaculation. At the end of the period semen analysis should be done to confirm the absence of sperm in the ejaculate. TEXTBOOK OF GYNECOLOGY SHEILA BALAKRISHNAN SECOND EDITION PAGE NO 396