As a mother of 5, 4 of them girls, and the youngest two 15yo tins, I have to speak up.
Forbidding a normal part of growing up does not prevent it. You can;'t forbid your baby to learn to walk or talk. You can't forbid them to make new friends in kindergarten. And you can't forbid relationships with half teh population of the world.
To do so is to force your child to choose to not be true to themsleves or to lie to you.
If you encourage honesty, if you allow normal relationships, you get to discuss the choices they are making. If they want to go to a movie, just a couple and stay out til midnight, you have the oppurtunity to say that you're more comfortable with her group dating, that she has to be home by 10, and that you'll drive!
If it isn't discussed, then she can say she's sleeping at a friends, ride in a car with a 16 yo boy, stay out really late, etc. ANd you won't know till it';s history.
I think it makes more sense to offer to drive ALL the time (DH can do that too!) Let them play their music, stop and buy a dozen donuts and pass themn out. Be the parent who always offers to drive. You get worn out, but you know what' going on, they talk while you drive.
Also, if you allow them to date some, they learn early that boys are BOYS, in a safer environment. (No offense to boys, but they aren't very glamorous! THey burp, spit, carack rude jokes, etc).
My DD dont' date, not till they are in teh last year or so of High school. By then, well, you gotta let them do stuff cause the next year, they're away at college. You don't want them to learn it all then, trust me!