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Contraceptive devices intended to be worn before engaging in coitus to prevent sperm from gaining access to the female reproductive tract by providing a physical barrier between the penis and the vagina in order to prevent conception. They can also be used to provide protection against sexually transmitted infections by preventing microorganisms from being transmitted from one partner to another. Condoms are sheaths with one closed end and one open end that are made of seamless polyurethane, nitrile, latex, molded silicone, or lamb intestine; they are soft, thin, and transparent, and some come pre-lubricated.
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