A German social network for sex workers is looking for a "brothel tester" to check the quality of the service, standards of cleanliness and safe sex practices of brothels in Berlin.

Website Kaufmich.com (which translates as "Buying Me"), a social media platform for prostitutes, clients, brothels and companies specializing in the sex industry, is seeking a university-educated man or woman to join the company's "Quality Team," Kaufmich.com told CNBC.

The website's advert says that the candidate will have to test the service, cleanliness and compliance with safe sex practices in various brothels by taking a proactive approach to their work -- that is, by having sex with various women.

The website's product manager, Ben, who preferred not to give his surname, told CNBC via email that Kaufmich wanted "to establish a quality/rating systems for brothels."

"Having a brothel in Germany is totally legal but so far there is not a quality system for them in place. We want to be the Tripadvisor for brothels. Clients on Kaufmich should be able to check the quality of brothels before there go - like you check your hotel online before you book," he said.