Rational choice theory as developed by sociologists with the assumptions of economists ideas of individual behaviours seeking financial freedom, happiness, and self-interested actions is partially developed and lacks the individual motivation of each action. The social structure formed has multiple variations in terms of values and behaviour disciplines. The individual actions are responsible for the formation of large social structures which are well known in society and are considered to be the basis of societal norms. The institution of marriage has been evolving since centuries and has undergone multiple changes which are still unknown to the present class of people, but have a vague idea of what it was in the colonial and imperial centuries. The idea of marriage is again different in several cultures, religions, and regions across the world and does not resemble a universal acceptance. Marriage is different for the Western ad European countries, among the atheists, the Middle Eastern countries, and among the Asians and each culture and religion has varied perspective about the institution of marriage. Rational choice is considered as rational when the consequences are rational in terms of serving up an ulterior motive for both the individual and the society at large. The term rational is also debatable in many sense when compared with the ethical and moral values of individuals and cultures. There is a clear distinction about the rationality of actions and choices made by people for their marriages and the theory lacks confidence in explaining the persistence of marriage as all marriages do not meet rational futures and results even if the individual actions are considered as rational. Again the unintended consequences of marriages is the biggest hurdle for the validity of the rational choice theory because when unexpected consequences arises, the actions first considered as rational cannot be termed as rational when first taken. Thus, the theory is more relative and attached to flexible results instead of being a universal firmament in all cultures. The theory has explained that individual actions are always rational everyone will always consider some rational results of their actions and choices, but when the consequences are mixed up with unintended ones, the theory lacks validity and reliability. Marriages are more religiously conducted and accepted than being rationally based, because it has been attached to some kind of sacredness and the purity of the event is triumphant over the rationality of the actions leading to the marriage. Rational choice theory will require more debates and investigation of its basis and its association with either the rational actions or rational results which are expected. The theory is however thoughtful in proving that the intended actions are almost always rational for an individual but not the results, thus originating a seed of doubt in the theory.