Water buckets can be used in various ways for BDSM torture:
We all know the ICE bucket challenge, an activity involving the dumping of a bucket of ice water over a person's head. Can you imagine the effect on your sub when being done in restraints and perhaps unexpected?
In bondage, weight van add to the feeling of helplessness and increasing discomfort or even pain. A crotch bondage can be intensified when a bucket is being hung as a counterweight. The bucket can be slowly filled with water to increase the pulling of the rope in her crotch.