Humans are beings of attachment. We crave social interaction and seek to surround ourselves with others of like mind and the ties of blood. Survival was for a long time the motivational factor in this display of human nature, and it is a trait that has survived and been passed down through generations. It is unlikely that many of us would find ourselves in a situation that demands increased numbers as a means of survival, but the attraction of others remains a dominant part of the human condition. So we go out with our friends, and reunite with our families when the occasion arises all in the attempt to satisfy our need for socialization.