The concept behind Mithra is pretty much the same as Mi'qote and structured like real-life lion's pride. Men were born much more rarely and they generally gathered a harem that they mated with and who also did all the heavy-lifting for their patriarch. You can see the idea behind it in South Shroud, during the FATE at Takers' Rot. It's a huge group of female poachers all working for their one male leader. I think this is what made the Kazaam chieftainess unique is that tribe's departure from their traditional gender roles. XI's excuse for not having Mithran men was that they didn't need to lift a finger and Mithran women simply flocked to them just because they had a penis. There was a main story NPC in one of the expansions that was the only male Mithra in the game and all the Mithran women were constantly swooning over him.