For the Jain renunciate, total non-attachment to the body itself is the deepest form of continence
Jain teaching pushes past renouncing external things to argue that the deepest attachment a soul carries is to its own physical body, making bodily indifference the final and hardest form of continence.
The Acharanga Sutra's teachings on non-attachment extend the logic of the mahavratas to their furthest point: where most ascetic disciplines ask a practitioner to give up possessions, relationships, or specific pleasures, Jain teaching treats the body itself as the last and subtlest possession a soul clings to. Because Jain metaphysics holds that the soul, jiva, is fundamentally distinct from and only temporarily bound to matter, including its own physical form, complete spiritual freedom requires dissolving even the instinctive identification with bodily comfort, pain, hunger, and eventually life itself. This is the doctrinal foundation behind extreme Jain ascetic practices, including fasting and, in the most severe traditional cases, voluntary fasting unto death undertaken by advanced ascetics as the ultimate renunciation. In this frame, sexual continence is not the endpoint of Jain asceticism but an early and comparatively modest step on a much longer path toward total detachment from embodiment itself.
Acharanga Sutra