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How well something works under ideal or controlled conditions, like efficacy proven through scientific study.

A birth control device which is inserted into the vagina to cover the cervix and prevent sperm from entering. Diaphragms, cervical caps and contraceptive sponges are kinds of cervical barriers.

The whole of the phases of menstruation, which include, but are not limited to, the menstrual period.

Menstruation, infections and health conditions, birth control, abortion, vaccinations, safer sex and other preventative sexual health practices.