A pair bond is a relationship between two individuals, typically romantic or sexual in nature, where the two individuals are emotionally and/or sexually committed to each other. Pair bonds are characterized by a high degree of emotional intimacy, mutual trust, and exclusivity, and are often considered to be the foundation of long-term relationships, such as marriage or domestic partnerships.
Pair bonds are observed in many animal species, including humans, and are thought to have evolved as a way to increase reproductive success and enhance the survival of offspring. In humans, pair bonding can be influenced by a variety of factors, including cultural and social norms, personal values, and individual experiences and preferences.