One thing that stuck out with me was Donald Trump's books. He wrote two or three of them in the 1980's/1990's, and in each dedicated an entire chapter to prenups, why to have one, and why he had one. He went through two divorces and only ended up paying a few million dollars (pre-agreed upon), rather than half which would have been close to a billion. Agreeing how to end a relationship is much easier to do while you're still friends rather than enemies. Hopefully it never happens, but situations and incentives change, and having a prenup is an excellent hedge against the unpredictability of the future.