I can't be 100% sure they are all real women. But as I said, check her ID before let her go to your room. It is same chance you may find a ladyboy with his dick cut off at any other places.
Sorry Bro, i don't know the answer. You have to see it for yourself. You may just say to her like this"if you are a ladyboy i will send you back" and see what they say.