Updated April 23, 2010
VCF vaginal contraceptive film is a 2X2-inch thin sheet of film (similar to wax paper) and contains the spermicide nonoxynol-9. To insert, fold it in half, then in half again, and place it on the tip of your index finger. The film should be inserted into the vagina and be placed on or near the cervix. Spermicidal film will melt into a thick gel consistency by absorbing vaginal secretions, so it will act as a barrier to immobilize sperm. VCF must be inserted at least 15 minutes before intercourse for it completely dissolve and work effectively. A new piece of contraceptive film should be used for each sex session, and a single application is good for up to only one hour after initial insertion.
The sponge is a soft, round barrier device that is about two inches in diameter. It is made of solid polyurethane foam and has a nylon loop attached to the bottom for removal. The sponge must first be moistened with water and then the woman inserts it into her vagina before intercourse. It covers the cervix (opening to the uterus), and it blocks sperm from entering it. The sponge also releases a spermicide that can immobilize sperm.
©2014 About.com. All rights reserved.