No thanks, I'd rather know what I'm doing on my wedding night, not 6 months to a year later, or longer. I would like my husband to know what he is doing, too.
I wonder how much of the Christian fear of sexual experience before marriage is based on the fear of just not being able to please their partner, or of being compared to previous partners. If you get 'em young and virginal, they have no one to compare you to?
I definitely think teens need to be well-informed about sex and all the responsibilities/consequences that go along with. Keeping kids ignorant about it obviously isn't keeping them from figuring out the mechanics of it!

They really need to know how to protect themselves.