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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.

What is abuse and what kinds of abuse are there? Information on abuse including help identifying it, prevention, avoiding it and getting out, and healing.