I respect your opinion; but I still see it as kidnapping whether the law does or not. Under 21, no drink; under 18, no smoke; but at 14 it's not kidnapping if an 18 year old gets you to go across state lines with him? That's unbelievable. I'd like to say that extra charge of kidnapping won't matter, but knowing our justice system he might be out of jail someday.
I think you're hung up on relating kidnapping to crossing the state line. There was an old law, I think, the Mann Act, taking a minor across a state line for immoral purposes or some such wording. If that's still around he might get a federal charge.