Everything in adult life is a transaction, it's half sad but half only, it's a clear embodiement of our social reality. You make everything explicit and on paper to avoid pain (in this case natural disappointment from more fickle than expected bonds). That is unless you have a group of people with a solid notion of human bonds and who can clearly favor humans over business. Not the most common case I believe.
Yes I don't mean to formalize all human life, but I bet every contract that has been created was so because people suffered from dealing with the randomness of "others". Last instance was lack of official document for inheritance in my ancestors country.. now everybody is fighting to grab his piece and nobody can resolve the issue.
