Why do you advocate using condoms when they are not reliable?
It's true that condoms are not 100% foolproof. But they do play an enormous part in preventing unwanted pregnancies and diseases. Some important facts:
High failure rates are due to people using condoms incorrectly, inconsistently, or both. That is why including condom instruction in sex education is so important.
(See also: The Truth About Condoms)
You never know when you'll get lucky.