This document discusses five general perspectives on human behavior that influence relationships: biological, learning, psychodynamic, social/cultural, and cognitive. The biological perspective views love and relationships as fulfilling innate needs for intimacy, touch, and care. The learning perspective sees human behavior as influenced by environmental factors. The psychodynamic perspective focuses on unconscious psychological forces like libido that motivate relationship formation. Socially and culturally, marriage norms vary but exist in all societies. The cognitive perspective examines how partners view each other and the relationship. These five perspectives provide frameworks for understanding love and sustaining relationships but also present contradictions.