First Presidency (JT and GQC) maintains that plural marriage was "interwoven" with eternal salvation.
John Taylor and George Q. Cannon, "An Epistle from the First Presidency", Millennial Star 45, November 9, 1885, 711
Damnation was the awful penalty affixed to a refusal to obey this law [polygamy]. It became an acknowledged doctrine of the Church; it was indissolubly interwoven in the minds of its members with their hopes of eternal salvation and exaltation in the presence of God. For nearly twenty years this continued to be our faith and practice.