Alien Princess

On the planet Kamazu females make only around 11% of the world's population because of the virus that was created to solve the problem of overpopulation and eventually went out of control. Now the birth of females is super rare and they're treasured like princesses and treated as sex slaves.

Most of the population consists of gay males as trying to be straight is extremely expensive, for the poor majority trying a girl for just one hour in their entire life is very lucky.