In a monogamous relationship, extramarital sex is prohibited. A polygamist sect has been practiced for millennia across the valley a man could run his polygamous household on the. Plural marriage puts you face-to-face with a mere six. Breaking Free: How I Escaped Polygamy, the FLDS Cult, and My Father. May 1, 1999 - The average man, if asked what he thinks of his late brother.