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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.”

The internal passage between the anus and the colon; stores solid waste until it leaves the body through a bowel movement.

On the penis, the portion of the penis extending from below the head to the base of the penis, where it is attached to the body. On the vulva, an internal portion of the clitoris behind and beneath the clitoral glans.