Just because the accuser took back the accusation doesn't mean it wasn't a true accusation. It just means he decided to take it back for whatever reason. I mean, if there was nothing questionable going on, there'd be nothing to validate the original accusation to begin with. He didn't say "No, he wasn't fiddling me when I was 16." He's saying "Yes, he was fiddling me when I was 16, but I was okay with it."
So I guess the moral of the story is: As long as you get them to say its okay (and hope they don't decide to lie about it later), you can fuck 16 year olds to your heart's content.