Latex condoms, when used consistently and correctly during vaginal, oral, or anal intercourse, are highly effective in preventing sexual transmission of HIV. A condom acts as a barrier or wall to keep blood, or semen, or vaginal fluids from passing from one person to the other during intercourse. The package should indicate that the condom is latex and has a disease prevention claim on the label. It should be used with a water-based lubricant. A new condom should be used with every sexual encounter.