The Bod Squad

Five Western girls are kidnapped by Chinese pirates and sold to a brothel. While they are being trained to become prostitutes, a couple of local citizens take mercy on them and plot their escape by teaching them Kung Fu. The five scantily-clad girls, using their newfound martial arts skills then fight their way to freedom.
(Source: IMDB)
This was a collaboration between the Shaw Brothers and the German Rapid Film Company.