Am I crazy or didn't she say dragons can only be female? I might be hallucinating or something lol. It seems like they're a female "hivemind" in one big body and can reproduce with humanoid males of any species or something.
She never says anything about them all being females. Actualy it implies the opposite.
She says about her Matriarch (which is a female leader/brood mother) which is something she will become once she births her 1st dragonlongs.
She said that dragons learned to take the humanoid form in response to there lack of numbers... meaning there are/were males to breed with. This all implies that they are a species with equal male & female numbers but they use magical means to mate with mortals humanoids out of desperation.
Take the old myths of dragons kidnapping maidens, give it the PQ twist & all of a sudden those stories have some seriously rapey vibes.
Who's to say the male dragons aren't just stealing humanoid women to breed with?