Above the Extreme Origin Mountain, within the eighth Sky Layer, Qin Rui's Sky Palace floated elegantly above a bed of clouds. Amongst the numerous Sky Palaces that existed, hers was the smallest, whitest, and exuded an aura of yin that chillded the surroundings. This environment of hers forcefully made all her servants and subordinates, even her disciples, only females.
When men arrived, they would need a special tool to prevent the chilly yin aura from penetrating their flesh, entering their bones and blood. If it did, it's possible to undergo mutations, even become impotent. It also made it so no male characters, regardless of their status, would dare to step foot in her Sky Palace without permission.