You will find a reasonable number of local girls working in strip clubs in Berlin as the industry is relatively accepted socially.
At the weekends this is invariably 6.
The clubs are not breaking any laws selling sex on the premises so some do.
Heading out on a stag do and need the perfect venue to enjoy some male-friendly after hours entertainment? Similar to strip clubs in the USA, tipping is actively encouraged and it is not unusual for a girl to leave the stage during a performance to gather tips from the crowd.