I.
In the country of X, every woman was obliged by law to serve in brothels at least 10 hours per week, and young Marta from a decent middle class family was no exception.
On her 18th birthday her mother Raquel took her to be registered at a nearby brothel. The girl began serving the next Sunday. It was a public facility and had nothing as fancy as the private clubs. The layout was utilitarian, with beds separated by mere curtains, like a hospital.
Marta found things very difficult at first, especially because most clients were disadvantaged minorities, who had an insatiable lust for white women, and whose cocks were almost too large for comfort. Next to her bed other women moaned and screamed and laughed.
II.
Marta was the last girl in her class to reach adulthood. Some of her friends had already done their year's share of services and were now lying on the beach waiting to go to college. Suppose there's 52 weeks in a year, that's 52*10 = 520 hours of getting screwed for free!
Of course a lot of them cheated. Why play fair when one could bribe the scorekeeper? Men are weak because they think with the wrong head all the time. A girl named Bella let the administrator at her brothel sodomize her for the price of 80 hours a time and was free to go on vacation by the end of the week.
Others who believed in honesty tried to economize with their time. They would put in an hour on their way home from school, or skip a Friday night movie date and do the late shift. But it was grinding work, and by the time summer came one found herself still 500 hours away from total freedom.
III.
Marta's mother Raquel also served, for one remained in service until 50 or menopause, whichever came first. She went to the one near her workplace. It was one of the largest brothels in the country, with more than 500 beds available at any time, but still a trickle in the bucket compared to the amount of people daily visiting the city center.
Raquel used to make a big deal of it and wore a full set of lingerie to her service. But since then she'd realized it made no difference to the clients, who just wanted to satisfy their urge and forget about her. Now she went commando in a crotchless pantyhose to work, so that afterwards she could just pull the pencil skirt up and start serving.
Anal penetration was strictly prohibited due to hygienic concerns; she had to put her hands on her clients' chests and push them away on the first hint. There's no apologies, no excuses: anyone who attended to break the rule would be banned from free brothel service for a whole year. Raquel had learned her lesson the hard way.
IV.
The mandatory service in public brothels was a form of reparation tax introduced in 2016. Similar legislations existed across the continent to facilitate social integration, with generally favorable outcomes. Crimes had gone down and the sense of community and belonging had increased, now that everyone's getting more sex.
Proponents pointed to the service's progressive nature: only women of the lowest household incomes were exempt from the duty. Even the prime minister herself at the age of 38 regularly fulfilled her share of the hours, and special care was in place to protect her public image.