You had been kidnapped by Watto and being on display to see the highest bidder would buy you. It was all overwhelming and scary. You had to perform an act or something to get the highest bidder, or else you were doomed. You were dressed in something erotic to show off your body. As you were doing your thing and scared to go back to the cage, if nobody bidded higher than a fat grease soaked alien from a distant planet, Grievous happened to be out watching closely, intensely.