David O. McKay calls procreation "noblest purpose."
David O. McKay, "The Home, Family, and Happiness," Latter-day Saints's Millennial Star (February 1953): 36
The noblest purpose of marriage is procreation. Home is children's natural nursery. . . You know what a growing tendency there is in the Church to limit families. Happiness in the home is enhanced by the children around the fireside, climbing on the father's knee, receiving caresses from mother.