Whether you agree or disagree with the total abstinence issue, consider this. What if your teenager wanted to jump from an airplane but the pilot told you that there was a 1 to 3 percent chance that your child's parachute would not open on the way down. Would allow your child to jump? How much risk are you willing to take on your child's life when you consider what contraceptive you would prefer him or her to use? Even the most reliable forms of contraceptive come with a 1 to 3 percent chance of failure.