It is also called rubbers, sheaths, skins and prophylactics, and known by many different brand names. Most common condoms are made of thin latex rubber. Some condoms are coated with a dry lubricant or with spermicide. Different sizes, shapes, colors and textures maybe available. Used correctly, they keep sperm and any disease organisms in the semen out of the vagina.
Condoms also stop any disease causing organisms from entering the penis.
To be highly effective, it must be used correctly every time. Many men do not use condoms correctly or do not use them every time they have sex. Thus, they may risk causing pregnancy, getting STDs, or giving STDs to their partners. It is somewhat effective for preventing pregnancy as commonly used. 14 pregnancies per 100 women in the first year of use are the rate.