Just what 3DX does NOT need. Something which will cause more confusion as to who is male and who is female, to make it easier for men to trick other men into believing they are women to get sex with them.
What 3DX needs is honesty. It's okay if some men like to play as women (or futas), it's their right to do so, but they need to be honest about their real gender. NO ONE has the right to lie to, and deceive, others. shit like this suggestion will only help men lie and deceive more effectively by further clouding the matter of who is what.
And now men who lie, and deceive, others about their real gender will be giving me shit for posting this. Go ahead and out yourselves. Or, are you actually smart enough to keep your mouths shut and not out yourselves?