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The contraceptive sponge serves as a disposable barrier that is placed over the cervix to prevent sperm from entering the uterus during intercourse. This physical barrier mechanism is fundamental to how the sponge provides contraceptive protection. It is designed to be used alone or with a spermicide to enhance its effectiveness by killing sperm.

The statement regarding the need for a prescription is not accurate for the sponge, as it can be purchased over-the-counter in many locations. While the sponge does provide some level of pregnancy prevention, it does not guarantee a 100% prevention rate, as no contraceptive method can ensure absolute effectiveness. Additionally, the sponge does not offer protection against sexually transmitted diseases, which is another important consideration for individuals using this form of contraception.

Overall, the sponge's key feature is its role as a disposable barrier, directly interfacing with its primary function in contraception.