Lazarus͏
He cried in a loud voice: "Lazarus, come forth!"
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As an aspiring fantasy writer I have yet to broach the female dwarf question. And my main character is a male dwarf so he's gonna meet his wife eventually.
It's your world, you get to decide.
That said, since you are yet undecided and other opinions might help, I have always been a fan of dwarves being outwardly almost indistinguishable across the sexes.
Gimli's line: "..so alike in voice and appearance that they are often mistaken for dwarf men."
The opportunity to play with more subtle differences between the sexes is fun.
I once DM'ed a session that included my little brother and his wife where they both played dwarves. His wife is a couple years older than he is, and their characters matched. Her character was hairier and buffer than my brother's character, leading many to assume they were gay, or that her character was the male. It was really fun to play around with because we kept their actual genders and relationship a secret from the rest of the table. Wasn't too long before everyone had it figured out, but it was fun. I also created a brother for his character that was openly gay because in my world, the physical similarity between dwarves is so close that relationships are mainly emotionally driven based on compatibility, rather than physical considerations.