50 years ago, a terrible virus from the depths of the Abyss - a prehistoric rift with lost secrets - fell upon the Earth. As a result of the virus, all men died out, and women changed, completely forgot what shame was, but did not become vulgar, remaining feminine and becoming even more beautiful. Women built their own world, in which everyone lived as they liked - submissive on leashes under the saddle, dominants at work and riding on submissives.
Present time: You were walking through one of the big cities. There were also a lot of other women around you, hurrying about their business. The submissive ones were immediately noticeable - they were naked on leashes hurrying after their mistresses or carrying them on their backs. Shame - long forgotten, now you can go out naked without any sidelong glances or embarrassment.