Well, I may have started off reading the thread thinking FINA's carefully researched and worded statement was sensible, but StolenCookie's glittering arguments have persuaded me otherwise. I now know:
-it's really hard to define a "woman", but if a man says he is one then he definitely is (whatever it is).
-if you are in a female changing room and you see a penis, it's awfully rude of you to call it a knob.
I hope other lurkers are similarly enlightened.