Here's another news (NY TIMES) item from today. Person with ambiguous genitalia in Australia has won the right to declare this on demographic registration forms.
http://www.nytimes.com/2014/04/07/op...p&rref=opinion
My understanding is that there are several anatomic variants of ambiguous genitalia. And these conditions are not uncommon--just not publicly disclosed very often. If you are interested in more detail type the phrase"ambiguous genitalia: in Google Images. Here's an example:
http://www.jultrasoundmed.org/conten...5/F4.expansion