When the masters saw the world they saw many things wrong with it, they saw famine, and war, they saw cruelty and greed, they saw a people with little love for each other. The master's couldn't allow humanity to continue with this path, so of course they had to interfere, building and using a special mind control devise to change everyone for the better. Society stopped allowing violence, it stopped stealing from the weak and poor, and it stopped letting itself be ruled by chastity.
Yes the master's created a paradise filled with pleasure and sex, as it always should've been, but the master's still weren't satisfied. The masters disliked the existence of multiple genders, they felt it was best that there was only one, and so the gathered the humans they had saved and began to alter them. Out of the two genders they felt that females were the ugliest, the master's knew that appearance wasn't everything, and they never blamed females for their ugliness, but the could not help but to dislike them. So of course they changed all humans into the male gender.
"I am ready to be rid of my ugliness Masters." One Diana Summers stated as she entered the beautification center "We are happy to hear that Diana." A monitor showing the beautiful master told her "In addition to riding you of the ugliness of your female form, you are allowed to add new traits." The monitor continued. The image changed to show muscular beef cakes, feminine sissy boys, men with animal ears and tails, maybe even dicks, and some that were full on anthros.
"You shall have the option of taking any male form, you may add any features, you may beautify your in whatever manner you wish Diana." the monitor finished as it changed back to the masters. A holographic keyboard appeared before Diana and she began to create her new body, adding all the features she wanted, and when finished "I am ready masters." she said "This is the body you wish to have?" the monitor asked "Yes, it is everything I ever wanted, now please rid me of my ugliness." A flash of light came from the walls, and that was all that was required. Diana was no more, in her place was Danny a beautiful male...