Hard work
Small insignificant life fates of whores. No one cares about their need. They are just a money machine. They have to work at 110%, if they slow down in their pace, they get a strong reminder :-). Every pimp can do that, and whores know it very well, and that's why they fear this "arrangement" most of all. None of them want to have bruises on their bodies, then they won't make any money for their pimp. They don't meet the daily quota and are beaten again and again.