Erotic studios - hockley/city centre border
Garden of Eden - Coventry road
Anabells - hockley
At your service - Stirchley
Bluebells - digbeth
Kitty’s - Stirchley
These are the ones I can think of that are still open to the best of my knowledge. However some are dives, some are pricey, and some are both worth the trouble. Do your own research before you visit any