Journaling is an essential requirement in all BDSM relationships involving power exchange, role playing, humiliation, etc.. In order to sustain an equally gratifying relationship in the beginning stages, it is essential for the submissive to have an internal discourse on the collective experience and, eventually (preferably as soon as possible) verbalize the positive, exceptionally arousing, confounding, and/or dissatisfying elements of the scene..
I find that writing these internal discourses by hand adds to the intimacy of the act of sharing these thoughts with that O/one who knows you like no other..