Also called an internal condom, is a polyurethane pouch that has two flexible rings on either end. One ring is inserted into the vagina and the other ring stays outside the vagina. The rings help to hold the condom in place. Female condoms are 79-percent effective with typical use in preventing pregnancy, and 95-percent effective with perfect use. They also offer protection against some sexually transmitted diseases. They can be purchased without a prescription and, when the inner ring is removed, can be used during anal intercourse as well. Female condoms should not be used at the same time as male condoms.