baron arem heshvaun
"But there are less than one Dwarf female for every Dwarf male"
And there is less than one human male for every female on earth as females are genetically more common so thats not that rare. Or was that a typo. As for the topic why not assume a female dwarfs beard is a fashion statment all dwarves have the ability to grow full beards but some don't because it's not a social stigma for females to be beardless like it is for males.