Good prep for WESTPAC... or vice versa. As my old flight doc used to say "Remember boys, adams apples can be shaved down no problem and it's easier to make a hole then a pole."
The truth lies in the ring finger. In males (or former males) the ring finger is longer than the index finger. In females, the index finger is longer.
I'm not sure that this is 100%, though, so don't fire back at me if you find out differently the hard way.
I once told my troops before a port call in KL, "This place is the sex change capital of the world. If all of you go out and get a hooker while we are here, at least one of you will have nailed a dude. You don't want to be that guy." I couldn't tell you if my message worked or not, but we handed out a hell of a lot of rubbers at the watch desk when guys were signing out, so I'm thinking it didn't.