That utopia was revealed in Nauvoo, IL by which time Joseph smith had some 30+ 'wives', many concurrently married to another man!
It found its fruition in the Utah Territory under Brigham Young, where women were treated like cattle by the mormon leadership.
The 'revelation' smith had from God 'authorizing' plural marriage had never been repealed by any mormon prophet since, even though their prophet said they would stop the earthly practice - it is carried forward as a future practice in 'heaven'.
The demand to be 'perfect' in mormonism results in higher rates of depression and associated medications. I think divorce would be higher if not for the extreme social/family pressures exerted to keep things stable.
And watch - in Canada right now (and soon to come to the US) is the drive to make polygamy legal - based upon the redefinition of marriage brought about by the gay rights movement. If Canada legalizes it - what the migration north from Utah.
Mark 12:25 (New International Version, ©2011)
25 When the dead rise, they will neither marry nor be given in marriage; they will be like the angels in heaven.
http://www.equippingchristians.com/Does-Scripture-Support-Eternal-Marriage.php