In the time of the Buddha, it was common for both women and men, offered their services to wealthy households because of their poverty. There is There's nothing wrong with that, of course, but it was also very normal at the time that slaves were even traded, despite this being very against the principles of the Buddha's disciples. The quality of slavery that existed at that time and the way the Buddha often mastered both as a slave gave permanent peace by proclaiming the Doctrine to them, is illustrated in several stories in Buddhist literature.