Prostitution
There are also solutions that cover the prostitute as an independet entrepreneur. Therefore these self-employees have to inform the government about their transactions and business activities. In Germany e.g. a new prostitution law was passed back in 2017 wich forces those sex-workers to own a "prostitution-pass" they have to show their client. Many german sexclubs now don't employ the prostitutes anymore but rent them rooms for their activities and charge the club visitors with an entry-fee instead. A famous bordello in germany wich was a pioneer with that concept even before the law passed is the Club König in Lower Saxony.