A quick recap for those who were, until now, oblivious to prenuptial agreements: They are contracts, drafted by matrimonial lawyers, that stipulate how a couple’s assets will be divided if they divorce. They detail what spousal support will look like, and they ensure that both parties, in the best case scenario, don’t end up destitute. Still, they can’t dictate child custody rules, and — sorry, tabloids — can’t really enforce lifestyle stipulations. There are rumors that Beyonce has a cheating clause in her agreement with Jay-Z. This is cool, but, er, if that ever made its way to a court, a judge could easily dismiss accusations of cheating.