Gender was one of the few things that would cause "great personal embarrassment" on a long form BC.
Approximately 1% of live births have some degree of hermaphroditism, no particular reason the Obama/Dunham gene lines should be exempt.
Frankly, I was holding out for gender misidentification/ambiguity as being the reason he was so touchy about his BC, if he was born on US soil (half the requirements for NBC status).
Or in his case THE requirement for plain citizen status. (ignoring the possible invalid marriage problem).