The Oneida Community practiced complex marriage and eugenics.
The simple past form of "practice" is "practiced."
Marriage is a universal, not a trait.
Mu'tah is temporary marriage practiced by shittes .It is the same as prostitution or Zina (adultery ).It is Haraam ( prohibited) in Islam.
Samurai practiced ancient shintoism.They also practiced a form of Buddhism knownas Zen.
This was first practiced by the Pilgrims in the 1620's.
Actually -- sex outside of marriage is NOT practiced among 'genuine' Christians.For example: Among Jehovah's Witnesses, anyone who practices sex before marriage, or sex outside of marriage, or adultery; is a disfellowshipping offense. We actually PRACTICE disfellowshipping.Sex outside marriage -- is only practiced among 'psuedo' Christians; 'self-proclaimed' Christians; by people who 'call themselves' Christian. Therefore it gives a warped view of what genuine Christianity is all about.
jump the Broom
To my knowledge, Quakers have never practiced polygamy.
marriage
oligarchy
The form of Christianity based on Greek heritage practiced in the Byzantine Empire is Eastern Orthodox.