the horns of a cuckold (a man whose wife is having sexual relations with someone else). Rosalind asserts that the horns of the cuckold are the destiny of any man who gets married. She is declaring that all women are untrue and unfaithful.
Orlando argues that his “Rosalind is virtuous” (55). He believes that Rosalind would never be untrue and that he would never become a cuckold.