The surprising 'prenups' of America's richest couples

Successful power couples agree upon important issues from the get go.

And whether it's with a legally-binding prenup, or postnup, or a more flexible relationship agreement, they often put it in writing.

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Some of the most important issues couples should agree upon early on include sexual and romantic needs, family boundaries, and who pays for what, and putting it into writing can give a marriage a better chance of success.

Most breakups happen because of cheating, Gerber says: "Couples who face the reality of this threat head-on and deal with it stand the most chance of success."

"Don't be afraid to put it all in writing to refer back to as a living breathing document," she says. "And plan to have meetings about how you are running your marriage and family just as you would for your company or any other project you care about profoundly."

Here are some of the less conventional things successful power couples have put into writing:

Mark Zuckerberg and Priscilla Chan agreed to spend more time together

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Jessica Biel and Justin Timberlake have a clause about cheating

Nicole Kidman and Keith Urban agreed not to tolerate drug or alcohol abuse

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Jay-Z and Beyoncé treat motherhood like a job

Rapper Jay-Z and singer Beyoncé reportedly signed a prenup that gives her $5 million for each child they have together. The prenup also stipulated that Beyonce would receive $10 million if the marriage ended before two years and $1 million a year for every year they remained married up to 15 years.

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