Duke Nukem: Land of the Babes – Playstation 1 – PS1
In the future an alien race has eliminated the entire male population of earth and enslaved the few remaining women.
However, some women managed to escape, and united to form the United Babe Resistance (UBR). Using a time portal device, the UBR tracked down Duke and made his choice very simple, help them now or there will be no chicks in the future. Being the chivalrous hero that he is, Duke promptly signs up to help the babes in the game Duke Nukem: Land of the Babes.