Surprisingly, mainstream LDS Mormon policy concedes that a Mormon woman, if properly sealed to eternity to each of her earthly husbands, can be a polygynist for eternity!!!
But what about in the Here and Now??
No. (They haven't figured out a way to get it past the social & doctrinal "YUKKKK" factor reaction. But hey, if they could still be withholding "priestholder status" from blacks when Mitt Romney was a tithing 30-yo member of the church, who knows what whims the Lds "prophet" will operate upon next?)