Nothing is that simple that finding sex in Zurich, to such an extent that the city has just allowed prostitutes to conduct business in drive-in sex booths. Zurich is a nice city and an important business center where you will find lots of brothels and escort girls clubs.
Juste near the german border, Zurich contains sex clubs, erotic massage parlors and somme FKK saunaclub, the typical form of the german brothel, which mix with escort girls club and wellness center. However the city is a dynamic and rich spot, and brothels are for most of them luxury places.
The easiest way to have sex in Zurich is to go to a FKK saunaclub like the FKK saunaclub Rouge or the FKK Swiss Club. Otherwise there are some great brothels like the club Mary or the Club Beatrice. In any case you will enjoy beautiful girls and great acomodations.