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In page Family planning:

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Sperm donation is another form of assisted conception. It involves donated sperm being used to fertilise a woman's ova by artificial insemination (either by intracervical insemination or IUI) and less commonly by in vitro fertilization (IVF), but insemination may also be achieved by a donor having sexual intercourse with a woman for the purpose of achieving conception. This method is known as natural insemination (NI).[citation needed]