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Old 08-10-2012, 10:22 PM   #7
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Re: Vasectomy (permanent?)

according to PP
Both the ParaGard and the Mirena IUDs work mainly by affecting the way sperm move so they can't join with an egg. If sperm cannot join with an egg, pregnancy cannot happen.
For some women, Mirena may prevent the egg from leaving the ovary. Pregnancy cannot happen if there is no egg to join with sperm. Progestin also prevents pregnancy by thickening a woman's cervical mucus. The mucus blocks sperm and keeps it from joining with an egg.
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