[imtringued]

Actually, you don't care if your partner agrees to the prenup. You care that your partner's lawyer (you can't have the same lawyer for this) agrees to the prenup. The reason for this is that there are judges that are hostile to prenups and you need evidence that your partner made an informed and explicit agreement.

Also don't add sunset clauses because those are ticking time bombs. There is nothing worse than having a stable marriage only for a looming deadline to change the incentives towards instability.