Predicament bondage

Predicament bondage is a form of bondage, typically in which a person is restrained with an option of placing themself in one of a pair of uncomfortable positions, which are sufficiently uncomfortable that the person is forced to shift after a time to the other position. The default position is typically intended to cause muscle fatigue, such as standing on tiptoe, which forces the subject to choose a more physically painful position, for example letting themselves lower their weight and stand regularly while forcing a rope attached to their genitals to pull taut and cause pain.
Predicament bondage can also involve the use of a single position in which remaining still will not cause any discomfort for the subject, but moving their body will pull on ropes, weights or other devices meant to cause them pain. The subject may then be tickled, sexually pleased or otherwise enticed to move uncontrollably.
When performed with multiple submissive participants, a predicament bondage scenario may force one to choose a position that causes pain to the other whom they know and love. The dilemma of being able to spare a loved one pain by submitting to pain, or sparing oneself from pain by submitting another to it, is used in BDSM and master/slave play.