The fact that the criminal law in England and Wales continues to afford protection to spouses who conspire together to commit crime is considered by many to be an anachronism. That a person cannot be guilty of conspiracy if the only other person with whom he or she agrees is his or her spouse, is to be found in section 2 of the Criminal Law Act 1977. The origins of the rule are said to be based on biblical principles pertaining to marriage. The difficulty with that is that the concept of marriage has changed significantly over time, which raises the question of whether or not the existence of the exemption can today be justified. In R v Yilkyes Finok Bala and Others [2016] EWCA Crim 560, the Court of Appeal was faced with the question of whether or not the legislative exemption applied to those who were party to a polygamous marriage. While acknowledging that there are arguments in support of the proposition that the exemption is outmoded, the Court of Appeal nevertheless interpreted the statutory provision in such a way so as to encompass parties to a polygamous marriage recognised under English law as valid. By virtue of the Civil Partnership Act 2004, the exemption was extended to cover civil partners. The expansion of the exemption is curious in the light of prevailing attitudes towards the applicability of the exemption at all in modern times. Furthermore, other statutory provisions (relating to analogous matters) have either been enacted or repealed to reflect present-day understandings of how the issue of marriage interacts with the criminal law. Yet, for reasons which are not altogether clear, the spousal exemption vis-à-vis the criminal offence of conspiracy remains in force.