(CNN) — I bet you’ve experienced sexual chemistry with someone. But have you experienced what’s called sexual harmony? Maybe you’ve fallen in love? But was it “emergent love,” a concept that requires certain elements for love to emerge? And once your relationship got rolling, what kind of couple were you? Whatever your relationship looks like, my colleague Dr. Sara Nasserzadeh has seen it.

Based in Los Angeles, Nasserzadeh has a doctorate in social psychology and focuses on sexuality and relationships in her private practice as a therapist. She been researching and working with couples across more than 40 countries for more than two decades and seems to be in a state of perpetual curiosity about what makes them tick. Javascript is required for you to be able to read premium content.

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