There is no consensus in the literature on how marital idealization affects marriage. People tend to see their partner and the relationship in a positive light. Idealized images can contribute to the feeling that the chosen partner is "the one", but it is still debatable whether idealization positively or negatively affects the romantic relationship and satisfaction with that relationship. Also, previous research results concerning the relationship of the idealization with participants' sex and age and the length of marriage are not consistent. Therefore the aim of this study was to examine whether there are sex differences in the tendency to idealize marriage and to examine the relationship between the tendency to idealize marriage and satisfaction with marriage, duration of the marriage, and with the chronological age. It was expected that there would be no difference in the tendency to idealize between male and female participants. It was also expected a positive association of the tendency to idealize marriage and marital satisfaction and a negative association of the tendency to idealize marriage with chronological age and duration of marriage. The research was conducted on a sample of 487 adult married women and married men who filled out an online questionnaire composed of three parts: a sociodemographic data questionnaire, The Scale of Tendency to Idealize Marriage and The Scale of Marriage Satisfaction. According to the research results, married men are more inclined to idealize marriage than married women. Furthermore, the tendency to idealize marriage and satisfaction with marriage are highly positively correlated, while the correlation of the tendency to idealize marriage with duration of marriage and chronological age is negative and very low.