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A barrier method of contraception somewhat similar to a male condom, but inserted into the vagina rather than put on the penis. It has a flared base that sits on the outer parts of the vulva to hold it in place. Also known as an internal condom.

Surgical blocking of the vasa deferentia (each vas deferens) for permanent birth control.

When a birth control method is used correctly and reliably, the whole time, every time, in accordance with the manufacturer’s directions. Many birth control methods will state an effectiveness for “perfect use” vs. “typical use.”