Prostitution in Germany is legal, as are other aspects of the sex industry, including brothels, advertisement, and job offers through HR companies. Full-service sex work is widespread and regulated by the German government, which levies taxes on it. In 2016, the government adopted a new law, the Prostitutes Protection Act, in an effort to improve the legal situation of sex workers, while also now enacting a legal requirement for registration of prostitution activity and banning prostitution which involves no use of condoms. The social stigmatization of sex work persists and many workers continue to lead a double life. Human rights organizations consider the resulting common exploitation of women from East Germany to be the main problem associated with the profession. Sex work in historically German lands has never been outlawed and has been described since the Middle Ages. Since the 13th century, several German cities operated brothels known as Frauenhäuser ("women's houses"); the practice of sex work was considered a necessary evil, a position already held by Saint Augustine (354–430). Some municipalities actively encouraged it and far from existing on the margins, sex workers were often honoured guests, who maintained domestic order as an outlet and lesser evil to such things as adultery and rape. The city also gained tax revenues from the prostitutes. Emperor Sigismund (1368–1437) thanked the city of Konstanz in writing for providing some 1,500 workers for the Council of Constance which took place from 1414 to 1418. Sex workers were more vigorously persecuted beginning in the 16th century, with the start of the Reformation and the appearance of syphilis. In 1530, Charles V ordered the closure of brothels throughout the German Holy Roman Empire. Section 999 of the 1794 General State Laws for the Prussian States determined that "dissolute female persons who want to do business with their bodies ... would have to go into the whoredom houses tolerated under the supervision of the state".