"In these new introductions, we see that 'plural marriage' (notice, not 'plurality of wives') is to be viewed as a principle and not as a commandment, and that the 'standard' of marriage is monogamy," Hudson, co-author of "Sex and World Peace," writes in an email. "Small changes such as these can be momentous in their impact on the lives of current and future Saints, which is no doubt why they are attended to with such concern and finesse."