This study investigates the factors most influential in determining relationship satisfaction among heterosexual couples in the U.S. The study contributes to the recent discussion regarding whether married or cohabiting couples are more satisfied in their relationships, as well as the literature investigating the factors involved in measuring relationship satisfaction. Using binary logistic regression, I analyze how under-explored factors including age, race, gender, income level, and number of children in the household influence relationship satisfaction among married and cohabiting couples. The results of this study emphasize the significance of understanding the complex nature of relationship satisfaction and shed light on the nuanced interactions between these variables. I find that it is men who value the status of marriage, while women’s relationship satisfaction suffers from age defining standards and the role of mothering. This paper leads to more research investigating the benefits and drawbacks of cohabitation and marriage, including factors predicting relationship stability and dissolution among couples in the U.S. by gender.