A study of 15,000 teenagers surveyed showed that 15%-52% answered incorrectly to 3 questions involving proper condom use.
Those surveyed were 15-21... Imagine how swiftly the percentage of those who answered incorrectly would increase if all the people younger than 15 who are apparently sexually active were surveyed as well.
What does that say about the likelihood of irresponsibility among teenagers having sex? Even if they do use protection, slip-ups can still occur.
Adults have the maturity to realize that sex is not to be taken lightly, but teens often don't. If they have to use scare tactics to keep teens from having sex, that just reflects how completely teens ignore reasonable advice.
Now that I've graduated high school and am preparing to head off to college, I realize that having sex would have been an error on my part; to this day, I am still emotionally unprepared to face that vulnerability with another person.
Additionally, I now realize that even the .000001 percent chance of pregnancy when using multiple forms of protection is far too great of a risk; a baby would have ruined everything I now have the opportunity to do in my life.
When I was younger, I didn't have the perspective I do now, and I sure am glad that my parents scared me into celibacy ("If you get pregnant, I'm forcing you to have an abortion or sending you to live with your Mormon family" - Mom) until I was mature and responsible enough to make my own decisions.
And what do you know - when I was mature enough to decide for myself, I chose celibacy all over again, because I know it's right for me.
Whether people choose other things when they reach that point of real responsibility (as in, "If I get pregnant, I am prepared to drop everything and change my plans to accommodate my child") is beyond my control and beyond all adults' control; however, while a teen is still naive and in that "I know everything there is to know and all these adults are dumb and just trying to ruin my good time" phase, I feel like adults have every right to insist upon abstinence until the teen is truly responsible (and educated) enough to make their own decisions.
I agree that abstinence only education is wrong; while the risk and the possibility of pregnancy should still be emphasized, you'd be amazed how many teens don't know that there needs to be space at the tip of a condom and that birth control pills need to be taken every day at the exact same time (with no other medicines to interfere with their effectiveness, especially antibiotics) in order to be fully effective.
Without the seemingly minor but drastically important aspects of birth control methods being made known to teens, their multiple forms of birth control are essentially as effective as pulling out.
For the record, I don't think promiscuous sex is ok at any age, over 18 or not; for adults to partake in that and then insist upon abstinence is hypocrisy and inherently wrong.
However, I feel as though my parents' insistence that I remain abstinent benefited me in the long run.