We're not likely to have consensus on a neutral term anytime soon, however disappointing that may be. The influence of political correctness, television daytime programming, imperfect understanding even among those who use terms consistently, different agendas, etc. probably mean that no single term will ever be accepted by everyone. As the quote from Bierce below implies, we could consider the term "girl" or "boy" to refer to non-reproducing persons of the respective gender, regardless of chomosomal endowment. But I know that's not likely. It could lead to interesting sentences like "Oh, him? He's a girl, you know."