These are contracts that are entered into prior to the marriage taking These must be in writing and signed by both parties in order to be enforceable. The agreement has to be entered into voluntarily, and it cannot be unconscionable when executed. In addition, both spouses must be fully informed and provided with fair and reasonable disclosure of all the property and financial interests and obligations of the other spouse. In other words, all of your information must be turned over to the other spouse and their lawyer. There is an exception if your future spouse voluntarily waives the disclosure of this information and had adequate previous knowledge of your financial holdings and obligations.