Which contraceptive method is inserted into the vagina before intercourse and typically removed after a few hours?

The sponge is a contraceptive method that is designed to be inserted into the vagina before intercourse and typically removed after a few hours. It contains spermicide, which helps to prevent pregnancy by killing sperm and blocking the cervix. The sponge can be inserted into the vagina several hours before sexual activity, providing a barrier to sperm and acting directly as a chemical agent against sperm.

In contrast, while the diaphragm is also a barrier method used for contraception that is inserted into the vagina, it generally requires a healthcare provider's fitting and is usually left in place for a longer duration, often up to 24 hours, which differs from the more temporary use of the sponge. A condom, while effective for preventing sexually transmitted infections and pregnancy, is not inserted into the vagina, but rather used externally over the penis. Lastly, an implant is a long-term contraceptive method that is placed under the skin of the arm and releases hormones over a period of years, not something used temporarily or removed after a few hours.