affiliative drive

[ uh-fil-ee-uh-tiv, -ey-tiv ]
/ əˈfɪl i ə tɪv, -ˌeɪ tɪv /

noun

the urge to form friendships and attachments, typically prompting a person to attend social gatherings and join organizations as a way of preventing loneliness and gaining emotional security.

Origin of affiliative drive