The birth control sponge is 86% effective if you have never given birth and 73% if you have. It is filled with spermicide, which is a compound that kills or immobilizes sperm. To use it ...

Once the most popular female-controlled, over-the-counter form of birth control, the sponge was used by 6.4 million women between 1983 and 1995. It was discontinued when the original manufacturers ...