Main Page | See live article | Alphabetical index Spermicides are substances that are sperm killing. Usually they are used to increase the effectivity of contraceptive barrier methods like diaphragmss and condoms, they are only somewhat effective alone. The most common active ingredient of spermicides is nonoxynol-9, which some women are allergic to, and which has been shown to increase the risk of contracting HIV. See also Sperm This article is from Wikipedia. All text is available under the terms of the GNU Free Documentation License.