Amen. This isn't a rape case, and using statuatory charges to deal with dating kids is a bit much. If daddy is so upset, he should start by having a nice loooooong sit down with his dauther. If her thighs stay in the same zip code, this doesn't happen, so that darling little angel is every bit as much to blame as the boy a grand total of two years her senior.
Note I'm not endorsing teen sex, or sex with 15 year olds.