I have to update you that Thailand has been introducing 'special' toilets in many schools specially for Khatoeys or Ladyboys. Soon it might go public and you might be confused with the sign.
Well, no harm using it when emergency.
"Hong Nam Yoo Tee Nai?"
(Where is the toilet?)
In my earlier blog about Ladyboys Of Thailand, it has shown the public acceptance in their kingdom. So far none of my many Thai relatives & connections is a ladyboy otherwise I would interview 'her' and blog here!