“There is no such thing as a relationship without a contract. All relationships are governed by contracts, be they implied or explicit. Relationship contracts are not legal contracts, though sometimes societal expectations of relationships get worked into law (this can come into play in situations like divorce as well as the legal establishment and relinquishment of paternity).
The society in which you grew up provided you with a set of template contracts to which you implicitly agree whenever you enter a relationship, even a non-sexual one. For example, a common clause of many societal template contracts among friends involves agreeing to not sleep with a friend's recent ex. While you may never explicitly agree to not sleep with a friend's ex, your friend will absolutely feel violated if they discover that you shacked up with the person who dumped them just a week earlier.
Essentially, these social contracts tell an individual when they have “permission” to have specific emotional reactions. While this may not seem that impactful, these default standards can have a significant impact on one’s life. For example, in the above reaction, a friend who just got angry out of the blue at a member of their social group would be ostracized by others within the group while a friend who became angry while citing the “they slept with my ex” contract violation may receive social support from the friend group and internally feel more justified in their retaliatory action. To ferret out the contractual aspects of relationships in which you currently participate, think through something a member of that relationship might do that would have you feeling justifiably violated, even though they never explicitly agreed to never take such action.
This societal system of template contracts may have worked in a culturally and technologically homogenous world without frequent travel, but within the modern world, assumed template contracts cause copious problems.”
―
Simone Collins,
The Pragmatist's Guide to Relationships
