Looking for a vintage movie probably Danish

I am looking for a vintage movie which ı watched when ı was a teenager. The story was about a very short haired blonde undercover police officer. Her task was infiltrating into a psychotic group. The group accepted her as a whore that would work for them on the streets. She was trained to be whore at a mansion where she was kept with tied hands to the ceiling, blindfolded and gagged with a gag ball. Anyone at the mansion could use her either tied or freed but she had to obey all the orders. she was taken to weird parties and used roughly. Finally she was sent to the streets as a whore and her first money was gained by serving to two men...Ohh god it was such a hot movie. Does anyone remember the name of that movie? Can you help me find that movie? It should be a Danish movie or Finnish or Swedish.