為另一半結紮，是好男人。但男性絕育手術，並非「即時生效」。好比，沒有兵工廠，但仍然有子彈在槍枝裏面。
https://www.nhs.uk/conditions/contraception/vasectomy-male-sterilisation/
至少需要在最初的8到12週內使用另一種避孕方法，因為可能需要很長時間才能清除管中剩餘的精子。時間因人而異。在這段時間裡仍有懷孕的風險。 You'll need to use another method of contraception for at least the first 8 to 12 weeks, as it can take this long to clear the remaining sperm in your tubes. How long this takes varies from man to man. There's still a risk of pregnancy during this time.
手術後約12週進行精子檢測。確認您的精液不含精子，輸精管結紮術便是成功，可以停止使用其他避孕方法。有些男人可能需要兩次測試。但在確認您的精液中沒有精子之前，請繼續使用另一種避孕方法。少數男人會繼續有少量精子，但是這些精子不會移動，也不太可能使您的伴侶懷孕。About 12 weeks after the procedure, you'll need to produce a sample of semen, which will be tested for sperm. Once tests have confirmed that your semen is sperm-free, the vasectomy is considered successful and you can stop using additional contraception. Some men may need 2 tests. But until it's been confirmed that your semen is free of sperm, continue to use another form of contraception. A few men will continue to have small numbers of sperm in their system, but these sperm don't move and are less likely to make your partner pregnant.
