Are all women 'sold off' to the clubs at, say 18, or only a selection of the population? Are all the women compliant with their fate, or does some of them resisting and if so, how? Can a man own more than one woman? What if any rights do the slaves have? How does men feel about their daughters being sold off?
Of course, if it's just 'criminal' women who are sold then it's all so much easier. Never mind that the charges are doubtful in many of the cases.