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ORIGINAL: antipode

Quickest way out of this is to ask 'em.

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X is whipping Y. So the obvious impression is that X is the dominatory personality and Y is the submissive personality.

However, let's put it into real context. We don't go around hitting each other as a normal rule. Therefore the only reason X is hitting Y in this case is because Y enjoys being hit. So X is hitting Y to satisfy Y's enjoyment.