How refreshing - you disagree, you have a fair point (which you didn't have to lie to make), and you didn't even have to call anyone a retard or douche bag. Well done!
I don't think, though, that your comparison is apt. Driving isn't the same as sex. When I was 13, did I want to drive a car? Sure. It would have been cool and liberating, I guess, but it wasn't a big deal.
Did I want to have sex, or some sexual experience (not that I really knew what that meant)? Hell yes, I did. I really really really did. I was a 13 year old with exploding hormones. I didn't have sex until a few years later, but not because of some moral code, because of lack of opportunity.
If you don't give me a spare set of keys, what happens? Do I hotwire the car? Steal someone else's car?
What happens if you don't give me knowledge/access to birth control? I already HAVE the "car" in this case... you can't take it away from me. At least teach me how to use the seat belts.
Of possible outcomes for my daughter on her 18th birthday I'd rank them:
#1 - Minimal sexual activity, no sex.
#2 - Sex. No pregnancy, no STD.
#3 - (very very distant 3rd) Sex, pregnancy/abortion or STD.
I'd take 1 or 2, 3 would be a pretty crushing blow. I just believe denial of education and access to birth control is the surest route to #3.