將理性選擇理論應用到婚姻中，人們會思考個人為選擇一個合適的伴侶而做出的決定的有效性和可靠性。當一個人選擇伴侶時，很明顯，所做的選擇實際上是在考慮了各種理性原因後做出的，這些理性原因重視該決定的有益後果。例如,當一個男性個人決定嫁給一個女人她的選擇,男人會做出理性的原因,女人會滿足他所有的情感、身體、金融、調整相關,和世界觀相關需求除了人的期望的女性和他在每一個階段的生活,無論是好還是壞。這使得選擇看起來是理性的，但是這裏出現了一個問題，這個決定被稱為理性是因為它是個體的，還是從一個更大的社會結構價值體系中借來的，這個社會結構價值體系對人們做出特定的選擇產生了影響(England, 1993)。同樣，女性嫁給男性也會對婚姻和嫁給她選擇的特定男性的後果做出假設和解釋。她會考慮長期的期望自己的內在的感受和期望從相反的性別和這些期望會比內在沒有其他女人的本能,通過外部社會結構形狀和她個人對婚姻的意義和一個女人的期望。因此，這兩個人有幾個選擇，他們依賴於這些選擇，並認為他們自己的解釋是理性的。這些解釋更多地受到外部社會結構的影響，通過他們自己對婚姻的推理，以及他們自己對婚姻制度及其對他們的意義的解釋的發展而獲得(Bernard, 2011)。他們對婚姻的承諾是假設他們的決定是理性的，他們的祝福者、家人和朋友也假設他們的決定是理性的。這種選擇個人結婚的合理性來自於個人的行為和選擇，這在很大程度上形成了對婚姻的社會結構理解。
Rational choice are considered rational because the choice making individual gives a thought to the costs, benefits, consequences, and impacts of their choices. The very consideration of the consequences of all kinds of all individual choices is very much rational as it gives a rational meaning to the choice made and the individual responsible for the choice made and the action taken. The rationality is again considered to be complete when the individual is considering all consequences of the choice because the decision is taken with the availability of resources while making a choice. The resources available then become the determinants of the choices made and every decision will have different considerations as everyone will have different resources at their disposal.
Applying the rational choice theory to marriage leads one to think about the validity and the reliability of the decisions made by individual for marrying with a suitable partner of choice. When an individual makes a choice of a partner, it is apparent that the choice made is actually decided after considering various rational reasons that attaches value to the beneficial consequences of that decision,. For example, when a male individual decides to marry a women of her choice, the man would make rational reasons that the women will meet all his emotional, physical, financial, adjustments related, and worldview related needs in addition to the man’s expectation of having the women with him in every phase of life, be it good or bad. This makes the choice look rational, but here a question arises whether the decision is termed as rational because it is individual or it is borrowed from a larger social structure value system which has had an influence on the man to make a particular choice (England, 1993). Similarly, the women marrying a man will also make assumptions and interpretations about the marriage and the consequences of marrying a particular man of her choice. She would think about the expectations of her own inherent feelings and long term expectations from the opposite gender and these expectations would be no other than the intrinsic womanly instincts that has been shaped through the external social structure and her own individual attachment to the meaning of marriage and a woman’s expectations. Thus, these two individual have several choices made and they depend on these choices made and consider them to be rational in their own interpretations. These interpretations are more influenced for external social structure, attained through their own reasoning about marriage, and their own development of interpretation about the institution of marriage and what it would mean to them (Bernard, 2011). They get into a commitment of marriage assuming that their decision are rational and also assumed to be rational by their well-wishers and family and friends. This rationality of the choice of marrying an individual is coming from individual actions and choices which has largely formed the social structure understanding of marriage.