Paying the Bills with Her Body

Julia Jones was a moderately pretty and very timid woman, who was seemingly totally dominated by her husband. He makes it clear that he thought she was worth almost nothing except when it came to paying the household bills. There he gave anybody who was willing explicit permission to use her to act out their dark fantasies and take advantage of her deeply submissive nature, so long as they paid a bill in exchange.
In a busy couple of weeks, six of these benefactors have Julia in turn, each one making her submit to their will and suffer for their pleasure in different ways. In the process she endures bondage in many forms, electrical torments, voyeurism, and a fetish makeover. And after each session, no matter how cruel, she is pathetically grateful to her user. Some of her 'clients' are troubled by guilt at taking advantage of her nature, while others simply delight in mastering her.
But why does Julia really put up with such degrading treatment?