I fully support this. STIs are one of the biggest public costs of prostitution.
(Yes, this is a public cost. Every time a new person is infected with (e.g.) HIV, from an epidemiological perspective, that increases the chances of some copy of the virus in some person mutating into a virulent - even airborne - version. This is why you should care about HIV infection rates, even if you practice safe sex and don't use IV drugs, etc.[0])
> On other side many people lost unemployment support, because they refused to work in brothel as cleaners or maintenance personnel.
How is that any different from refusing to work in a hotel or a hospital as a janitor (or even as a nurse[1])?
They may not like the line of work, but that's no different from disliking taking a job at Halliburton. While I sympathize with the goal of choosing a job ethically, in the US (not sure about Germany), unemployment benefits and requirements aren't designed with that in mind.
[0] Even "curable" STIs are a public health problem We are already on the verge of creating - if we haven't already created - strains of gonorrhea that are resistant to all antibiotic treatments.
[1] You wouldn't believe some of the stuff nurses in hospitals have to put up with on a daily basis.