[TheThirdRuffian]

I’d go with XX or XY. XXY can pick.

[dayglored]

>> the solution is to simply label them penis and vagina. No mater what you “identify” as, you have to have THOSE parts to use that area.

> I’d go with XX or XY. XXY can pick.

I'm with TexasFreeper2009 -- go with the body parts you can see. I don't foresee chromosome testing stations in rest rooms. But if some guy pulls out his dong in the women's room, that's pretty obvious.

And in cases where you're not sure, maybe use the tried-and-true Crocodile Dundee Party Technique For Identifying Transvestites. If you've seen the movie, you know what I mean... :)