condom, male A sheath made of latex, lambskin, or other material that is placed over the erect penis before penetration to collect semen, preventing the semen from reaching the cervix, and thereby preventing conception. When used consistently, a condom is a reasonably reliable method of contraception, especially if it is combined with the use of a spermicide or a female barrier method (but not a female condom). Latex condoms also provide some protection against sexually transmitted diseases, including HIV, but lambskin condoms do not protect against HIV. A condom can be used only once. See also barrier method; birth control.
