The slavegirl needs to feel the distinct boundaries, the cruel harshness, and the non-yielding strength of the structure she is placed in. Uncomfortable, painful, and unpractical as it may be, her Owner have kept her in padlocked crude tight body-hugging steel chains for a while. In addition to confining her, it reminds her that she is a female creature, needing to be held close. And it leaves beautiful marks on her nude body when released. Chains are good for her.