Der Rausschmeißer (1990)

Frieder is a heavyweight - strong and terrifying. He is working as a bouncer in a shady bar. He has the mind of 8 year old. Fanny is a prostitute who knows every trick in the book but is only seventeen. To mess with her pimps, she promises Frieder a hot night if he roughs them up. Frieder keeps his promise, Fanny does too. This starts a fateful night for both of them.