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It’s about perceived power differential and autonomy in the relationship. That’s all about underlying control and dependency issues, which play into sex because sex, among other things, is very much about vulnerability and security, which are tied ultimately to sense of personal control and autonomy. That’s one reason (along with others related to the biology of mating) that sexual intimacy will inevitably suffer in any type of contractual or committed arrangement. As you know.
But the personal losses and emotional distress do generate enormous revenues and interest in doomed solutions for “putting romance back in your marriage”. That’s gotta be good for The Economy, right?