If liberal theory is to move forward, it must take the political nature of family relations seriously. The beginnings of such a liberalism appear in Mary Wollstonecraft's work. Wollstonecraft's depiction of the family as a fundamentally political institution extends liberal values into the private sphere by promoting the ideal of marriage as friendship. However, while her model of marriage diminishes arbitrary power in family relations, she seems unable to incorporate enduring sexual relations between married partners.