The best replacement for prenup is postnup.

The best alternatives to prenup are rated as following:
★★★★★  postnup
★★★★★  no prenup
★★  prenup
★  living trust
★  pre-nup
★  marriage contract
  community property

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Speaking about prenup, one probably shouldn't forget about no assets.

Other search terms related to prenup and their ratings are:
★★★★★ no assets
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prenup
postnup
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