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 ...

How well does it work? The sponge can be among the least reliable birth control. About 9 out of 100 people who have never given birth and been correctly using the sponge get pregnant.

This method is 88% effective with typical use. The sponge: The birth control sponge is a small round sponge-like device that is infused with spermicide. Although spermicide is in the sponge ...

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 ...