So how do I get her to hold off the whole sex thing until she's like, 30? Nah, you know, not 30, if I have to be realistic and not pathologically against her ever doing it - say 17. I could cope with 17. 18 would be better. You know, get through school without that as a distraction.
Do you go the "respect your body, don't give it away, the boys your age are just after one thing, save yourself for someone you love maturely, it's special and should be with the right person" angle and build her self-esteem so she can say "No, I'm worth more than a quick roll with a horny kid" route? That seems like the only logical way to me to get her to hold off without giving her any debilitating attitudes or phobia's.
Fathers are conflicted creatures. We love the idea of our daughters marrying a nice bloke and having a family and being happy etc, but we HATE the idea of anyone touching our little girl.