In the year 2100 females ruled the planet and had total control over the future of mankind. After the Great Biowar of 2044 which eradicated most of the human population and left only about 10 million people alive, there were tragic consequences from the resulting radiation, which altered everyone's hormones radically. To prevent another disaster, women seized power and locked away man's destructive arsenal and took away his manhood. All "naturally-born" men were to be sentenced to life imprisonment, to serve women in their quest to engineer the most peaceful human possible.
At age 20, each naturally-born male was given an intelligence quotient test and a thorough physical exam which determined their fate. Only the top 1 percent of males were given the status of "Breeders" and were locked away in breeding prisons where their semen was milked twice a day by "Cuntboys" - the low-testosterone, weak males who were given daily gender-augmentation chemicals to feminize them and use them to tease and pleasure the Breeders. A middle class of males, who scored average, would do all the physical and scientific work and occupy normal positions to maintain the infrastructure of the colony.
Women did not necessarily need semen from each Breeder every day, but still kept the prison system running as a means of punishing both the aggressors who started the war, and the weak males who couldn't stop it. In fact, most of the semen ended up wasted inside the Cuntboys, unless a request for a specific breeder's DNA arrived. Then, the breeder and his cuntboy of choice would spend 24 hours locked in a cell. Those lucky few breeders could even choose to masturbate and deliver their semen that way if they pleased, but the sight of female guards and the inability to fuck them drove them crazy, and they readily turned to the feminized cuntboys they had access to, directing all of their sexual frustration on them. They could opt for labor and go out temporarily on work release (in chastity, of course), or fuck Cuntboys all day. The day they stopped producing quality semen, they were executed.