“Spermicide” describes a bunch of different creams, films, foams, gels, and suppositories that contain chemicals that stop sperm from moving. You insert it deep in your vagina, so it also keeps sperm from getting through your cervix and into your uterus. It is 72% effective.
A diaphragm is a shallow, dome-shaped cup made of silicone. The diaphragm is inserted into your vagina, then it covers your cervix and keeps sperm out of your uterus. You must remember: For a diaphragm to work effectively, you need to use it with spermicide. It is 88% effective.
A cervical cap is a silicone cup you insert in your vagina to cover your cervix and keep sperm out of your uterus. There’s only one brand of cervical cap available in the U.S. today called the FemCap. You must remember: You need to use a cervical cap with spermicide for it to be most effective. It is 71-88% effective.
The sponge is a round piece of white plastic foam with a little dimple on one side and a nylon loop across the top. It’s insert it way up in your vagina before you have sex. The sponge works in two ways: It blocks your cervix to keep sperm from getting into your uterus, and it continuously releases spermicide. It is 76-88% effective.