Frankfurt Sex Guide advises where to find sex , working girls , prostitution , street hookers , brothels , red-light districts , sex shops , prostitutes , erotic massage parlors , strip clubs , FKK Clubs and escorts in Frankfurt , Germany. Frankfurt German: Frankfurt am Main is the business and financial centre of Germany and the largest city in the German state of Hessen. The city is known for its futuristic skyline and the busiest German airport. Prostitution in Germany is legal , and so are brothels. Adult entertainment is huge business in Frankfurt, unsurprising given the mix of large numbers of lonely business travellers and legal prostitution.