But I know what I am and I'm glad I'm a man and so is my wife (apologies to Ray Davies).
Recently had occasion to speak with a psychologist. In the course of the interview he asked me with which gender did I self-identify. I must have looked at him like he had lobsters crawling out of his ears because he then said, "I have to ask that."
Makes me wonder. If I can self-identify with a gender which does not match my biology can I self-identify as another species?