I think that the law could produce another side effect, because I think that more girls would accept to come and work in saunaclubs, at least all the ones who do not like sucking without condoms every guys, it is like French kissing, many girls do not behave in the same way with everybody, depending on chemistry and feeling, they provide this service or not, that is understandable, and according to me, it will happen the same thing with the blowjob without condoms but with extra cost, of course, and this is another reason why there could be more girls in saunaclubs, if they could earn more then it would be more interesting for most of them to work in a FKK ...
so the saunaclubs and FKK will become even more successful and the sex business will increase even more in Germany, this law will be then totally contraproductive for german government like everything related to prohibition (Politics will definitively never learn about past, prohibition laws will always end up with failing because of black market !)
but what is not good in this law from my point of view, this is the compulsory registration for the girls, I understand that a girl does not want to be recorded in a file for prostitution ....