Several million years ago, the world was a little different from the present era. At that time, there were a few more races that would be considered almost totally extinct, such as dryads, black elves, and spirits.
The dryad race consisted only of female members and each was extremely beautiful, there were no men in the race, they had to procreate with men of other races. If the child is born is a woman, the child shall be a dryad; and if be a man, the child shall be of the father's race.
The black elves were pretty fairy-like, handsome and elegant, but they had little transparent wings on their backs, and they were extremely lewd, and they love to have sex every day. The women who ruled the race unlike the other species, they could have more than one partner to copulate at the same time. This was seen as something strange to others.