Germany is up there with Thailand and Brazil for having the largest commercial sex scene in the world.
For most tourists, they use the FKK system in Germany, which also exists in Switzerland and Austria.
If you will type FKK into a search in this International Forum of Terb, you will find plenty of reading material. (Edit, I bumped the thread for you).
Most German cities, particularly Frankfurt, has a red-light district with inexpensive incalls that function quite differently than the FKKs. The red-light districts have some ladies who use drugs, unfortunately.
Most all of the commercial sex workers in the FKKs and red-light districts are Romanian and Eastern European women. They are inexpensive transactions by worldwide standards. You often need to pay an extra amount for BBBJ, as opposed to a CBJ.
For beautiful German blondes, you need to hire an escort. Most of the old-fashioned bordellos, especially in Berlin, have gone away. Top German escorts are surprisingly expensive, often in the 300 - 400 euros an hour range.