There are plans to make "unprotected sex" in prostitution illegal, what this would actually mean is not yet clear, but it probably won't be as dramatic as it sounds. Although the wording makes it seem that BBBJ is going to be prohibited, the police has already come out saying they have no idea how to enforce it (let alone the means to check up on a few 100.000 prostitutes. Certain parts of Germany already prohibit BBBJ and in some parts of Bavaria they actually have people checking what happens in clubs and appartments. But in other places like the Saarland there doesn't seem to be any enforcement of these laws.

In my limited experience in Bavaria, BBBJ was standard (although you sometimes hear that girls use the law to get extra money).