An open marriage is where both husband and wife are free to date and sleep with other people. So they are married but not monogamous. A natural daughter, depending on the context would be a biological daughter, as opposed to an adopted one or a step-daughter. I hope that helps!

Open marriage typically refers to a marriage in which the partners agree that each may engage in extramarital sexual relationships, without this being regarded as infidelity. There are many different styles of open marriage (such as swinging and polyamory), each with the partners having varying levels of input on their spouse's activities. NATURAL CHILD? A bastard ; a child born out of lawful wedlock.

An open marriage is not a traditional marriage. The man and woman are married for only legal or financial reasons. To me it's not a real marraige. They are married but they don't act married. they continue to do what they want freely. A natural daughter is a daughter by birth.