ACT recalls that plural marriage was required.
Annie C. Tanner, Mormon Mother: An Autobiography (Salt Lake City: University of Utah Press, 1983), 62
And yet, polygamy was not practiced by all men in the Church. I have heard the percentage placed at from three to five percent. As stated, it was promoted and practiced almost exclusively by Church leaders. This was in part due, perhaps, to the fact that only the more prosperous could afford to assume these added obligations. It was taught at that time that the second wife opened the door of salvation in the Celestial Kingdom not only for herself but for her husband and his first wife.