Married to the code without a prenup?
The concept of formal verification is to be explicit about what the requirements are. In the formal specification it is defined explicitly what the code should do, how it should behave in practice. In a sense formal verification aims to reduce ambiguity and restrict the behavior of the code down an agreed upon path. Formal verification in essence seeks to prove the correctness of the intended algorithms so that the behavior can be more strictly managed.
The absence of formal verification seems to be like a marriage to the code with no way of truly knowing where it will lead. In addition you don't know if it will halt, so you cannot even manage how to gracefully end things. In other words, the prenup in the case of formal verification is like determining in advance how things should end so as to avoid an infinite loop.
Don't take this post too seriously
This post is not to be taken as literal and is just an exploration in metaphor. So before computer science experts pick it apart just know it's a humorous post rather than a technically precise post. Sometimes when we look at our lives we can see algorithms, and we can see code, and the concept of marriage is legally defined (law is a code). The prenup was created to allow graceful exit.