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Humans have the capacity to form different types of relationships, which are mediated by emotions. We can divide these relationships into two categories: family and social. They create two types of structure: family and society. The family is held together by the pair bond between a man and a woman, parent-child bonds, and (to a lesser extent) sibling bonds. Society is held together by cooperative relationships, and (for large-scale societies) some degree of coercion.

Behavior is driven by emotions. Sexual emotions cause us to seek mates and form sexual relationships. Parents bond with children, and are motivated to protect and support them. Social emotions cause us to seek cooperative relationships with others and avoid conflict. Emotions cause us to self-organize into families and societies.

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