Because in Florida [url=http://www.huffingtonpost.com/2013/05/19/kaitlyn-hunt-florida-teen-felony-same-sex_n_3302713.html]you can be arrested and be charged with "lewd and lascivious battery", and be kicked out of your school[/url] it.
What terrible parents.
Edit: The pair were dating since the beginning of the school year at which time the girl who was arrested was 17. All parents were aware they were dating. The parents of the other girl pressed charges once she turned 18.
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I have a feeling if this was an 18 year old black guy dating a 15 year old white girl, Bungie Offtopic might hold a slightly different opinion.