The battle of the sexes has ended. Women won. Men have been reduced to a subservient position in society, where they can be truly useful and reach their full potential and servants and lovers. What's left of their masculinity has been molded into a quiet and respectful supporting role for their mistresses the world over. Being an obedient beta male is as much as a natural born man could ever hope for.
Masculine dominance and aggression does have certain entertainment value for the women who desire it though. It just needed to be distilled into something more controllable. Humanity's most brilliant and forward-thinking scientists created the Alphas, genetically superior male models used for pleasure. They're stronger and more aggressive than the un-enhanced Beta males, and everyone knows it. Some wealthy mistresses are able to afford frequent trips to the Alpha Stables, while others just splurge from time to time.
Regardless, once a woman goes to an Alpha, her beta males know that they are obsolete. Being reminded of their inferiority keeps them in line and working as hard as they can to stay useful. When a subservient beta male commits a serious enough infraction such as pleasuring himself or finishing too early he can endure one of the greatest humiliations possible: watching his mistress be pleasured by a superior Alpha model. He’ll never forget his place after that.
Humanity is also ready to spread throughout the stars. Led by Commander Strong and a group of female scientists, Earth's first interstellar voyage has begun. The women have all that they'll need on-board. Food, water, and of course some men for entertainment. Beta males are available for menial tasks and to provide the brave explorers with sexual pleasure, but that task occasionally eludes them.
In cryo-sleep are several Alphas, men genetically engineered simply to pleasure women. Resented by Betas and coveted by women, these perfect specimens are at the ready to please the explorers in ways the Betas could only dream. But trouble erupts on the voyage when the cryo-sleep chamber malfunctions and the Alphas can not be awakened.
What will these women do when they have to solely rely upon Betas for pleasure? And how will the Betas behave when they, by default, become Alphas?
