Book excerpt: "... describes and analyzes three types of agreements: premarital agreements, postmarital agreements, and domestic partnership agreements. A premarital agreement is a contract between prospective spouses, including same-sex couples, made in contemplation of marriage. A postmarital agreement is a contract executed by parties to an ongoing marriage and not incident to a divorce or marital separation. A domestic partnership agreement, sometimes known as a cohabitation agreement, is a contract executed by a couple whose domestic arrangements may not be state-sanctioned. However, the term also includes such an agreement executed incident to a civil union or registered domestic partnership. Generally, all of these agreements are used to define the property and support rights of the parties upon termination of the marriage or other relationship by death or dissolution. Some parties also opt to include financial obligations during the marriage or other relationship. This Portfolio does not cover separation agreements that settle property rights, spousal and child support obligations, and child custody matters incident to a separation or divorce"--Portfolio description.