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I think what you are describing has little if anything to do with psychopathy.
If I'm correctly understanding the material I've read about psychopathy, then the core or main emotion of psychopathy is the desire to "win", or be in a power position over others; true psychopaths are uninterested in sharing power or surrendering power, either inside or outside the bedroom.
If you look up "paraphilia" in wikipedia, the paragraph discussing the controversy of "the border between typical and atypical sexual interests" is relevant to your question, I believe.
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