CWP says plural marriage exists in eternity.
Charles W. Penrose, "Mormon" Doctrine: Plain and Simple, or Leaves from the Tree of Life (Salt Lake City: Juvenile Instructor, 1888), 51
In the case of a man marrying a wife in the everlasting covenant who dies while he continues in the flesh and marries another by the same divine law, each wife will come forth in her order and enter with him into his glory. Is there any reason why this should not be so? Is not each of these wives entitled to her position in eternity, by virtue of the sealing power which made her part of the man ? Why should one enter into the exaltation of the celestial world, and the other be relegated to singleness and servitude? They all become one in the patriarchal order of family government. And if this be the case in heaven, why should not similar conditions so far as possible exist on earth? Is earth holier than heaven? If a man receives from the Lord more wives than one under the sealing ordinances of celestial marriage, where is the moral wrong? They belong to no other man, but are his by mutual consent of all the interested parties, and they live together in the marriage state, one as much as the other.