Big Think

Our primordial drive for sex and love | Helen Fisher

Oct 15, 2025
Helen Fisher, a biological anthropologist and leading expert on romantic love and attachment, explores the complex neuroscience behind our feelings of love and rejection. She highlights how romantic love can be akin to an addiction, especially in the wake of heartbreak. Fisher explains the three evolved brain systems that govern mating—sex drive, romantic love, and attachment. Additionally, she shares practical insights on how to maintain passion and connection in long-term relationships, emphasizing the importance of novelty and affection.
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INSIGHT

Three Evolved Brain Systems

  • Human mating behaviors are rooted in three evolved brain systems: sex drive, romantic love, and attachment.
  • These systems are distinct brain circuits that evolved for different reproductive functions.
ANECDOTE

Childhood Lessons On Partnership

  • Helen Fisher recounts a nurturing childhood with clear lessons about partnership and sexual attraction.
  • She learned early that sexual attraction and respectful boundaries mattered in a healthy relationship.
INSIGHT

Functions Of Each Love System

  • Sex drive promotes broad mate-seeking, romantic love narrows focus to one person, and attachment sustains caregiving.
  • Each system evolved to solve different reproductive challenges across the lifespan.
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