“Why don’t I want sex anymore?” “Why do we feel like roommates?” “Why don’t we flirt anymore?” “Why do I feel more like a parent, coworker, manager, or caregiver than a partner?” These are some of the most common questions couples ask when something important has shifted in their relationship. Often they assume the problem is sex. Sometimes they assume it’s communication. Sometimes they assume they’re just tired. Or that this is what happens after kids. Or after ten years. Or