Thats the real reason you see so few female dwarves. They go out into the world and see this heterogeneous society and think they should act like that. Of course, with the patriarchy so rampant in fantasy worlds, when they make this choice of what gender to be, they generally pick male, not realizing the damage they're doing by reinforcing these gender stereotypes.
Duergar are the spawn of Illithid experiments, but are otherwise similar to their dwarven cousins in terms of reproduction.
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