I think all couples should sign a prenup.
Its a good idea, but judges can toss them so its not a guarantee.
You need to actually videotape the prenup signings with the lawyers, and have both people discussing it, and saying they aren’t under duress, and understand each part of the prenups. Preferably walking throgh each section and asking if there are questions, and if each understand each section.
I also believe paternity testing should be routine and mandatory. Not only for fraud/cheating reasons, but for potential future health issues like needing organs or blood donations from parents, which does occur. You don’t want to be a guy and find out during a medical crisis the kid your wife frauded/cucked you to velieve is yours, isn’t yours.