Life is uncertain and by being realistic about it and planning before a problem occurs; you can avoid a lot of issues in the future. Binding financial agreements are those contracts which are made before, during or after the course of a relationship. It is based on the planning of finances and asset division if the relationship falls apart.
These agreements are made between people before, during, or after a de facto relationship or marriage; the de facto couples can be of same or opposite sex. Although a lot of people frown upon such agreements; they may save you from a lot of legal troubles.