A proper fitting condom should cover the entire length of the penis while leaving a bit of extra room at the tip for ejaculation.
When used correctly, condoms are 98% effective. However, some people don't put them on right, and they are only 85% effective ...
When used correctly and consistently, condoms remain one of the most effective tools for the prevention of pregnancy and sexually transmitted infections (STIs). This includes external (male) condoms ...