Well, gender is a social inference and is independent of biological sex (though there are plenty of arguable links), especially in the 6th World with all its transhumanistic splendour. So generally, the gender a dragon (or anyone) presents as-is their gender. Although, one needs to bear in mind a few exceptions, such as: Identity crisis, intentional misdirection, differing understanding of cultural norms of that particular gender, comfort level, "trying to prove a point," etc.
So, based on the limited evidence presented in this thread, I would hazard that all dragons have the same sex, but different genders.
(This doesn't necessarily invalidate Chrona's statement any either.)