Having a true "whip fight" is preposterous. Real bullwhips were not used to strike animals (mules, oxen, or bulls, etc.) due to the terrible damage the whip would inflict on the animals, and the hide of those animals is much tougher than human skin. The tips of actual bullwhips can reach supersonic speeds - that is what makes the cracking noise! The noise was used to SCARE the animals. The whips used to flog prisoners were much shorter to lessen the speed and force of the flogging. Still many prisoners died from a relatively few lashes. A whip fight would leave both women terribly scarred if only a couple strikes occured.
Plus, it would not matter if the women were topless or not. The whip would shred any clothing like a razor.
A staged "photo op" whip fight can be filmed but a true whip fight would be like a duel with pistols that never ran out of ammunition.