 The preceding two rationales are both weakened by the diminished social role of marriage; changing legal and social norms undermine its effectiveness as a policy tool. In the 20th century, marriage was beset by a “perfect storm”: the expectation that it should be emotionally fulfilling, women’s liberation, and effective contraception (Coontz 2006, Chapter 16). Legally, exit from marriage has become relatively easy since the ‘no-fault divorce revolution’ of the 1970’s. Moreover, cohabitation and child-rearing increasingly take place outside marriage. This reflects the end of laws against unmarried cohabitation and legal discrimination against children on grounds of ‘illegitimacy’, as well as diminishing social stigmas against such behavior. Given such significant changes, marriage is at best an indirect strategy for achieving goals such as protecting women or children (Cave 2004, Sunstein and Thaler 2008, Vanderheiden 1999).