Polygamy is most notably practiced in the United States by the astonishingly crazy Fundamentalist Church of Latter Day Saints, a long-winded offshoot of comparatively normal mormonism. It was started by this guy:
This is the man who has generously volunteered to haunt your nightmares."/>
"I spent 17 years being beat by my mother 'cause I wouldn't be obedient to my father ...and he wanted me in his bed..." said an unnamed woman on video. Let's think about this for a second. A woman beat her daughter for NOT having sex with HER OWN FATHER.