Boredom is a special kind of torture and the human mind will take any stimulation it can get.

HYDRA employs sensory deprivation to mold Bucky into the compliant and dependent Winter Soldier. The lead psychologist overseeing his training takes this opportunity to condition the Winter Soldier to desire anal stimulation.

Immobile, in a black and soundless void, the subject comes to yearn for these clinical violations, the only sensations it receives for weeks on end.