Condoms are thin sheaths made from polyurethane, latex, lambskin or other materials and worn over the penis during penetrative sexual intercourse. When used properly, condoms help to prevent pregnancy, sexually transmitted disease and sexually transmitted infections.

Condoms have been definitively shown to protect against HIV, gonorrhea and other harmful STDs, and the Center for Disease Control (CDC) notes that latex condoms prevent the transmission of the smallest known STI pathogens when used correctly and consistently.