Introduction: the first Intercourse experience has an important role in sexual health as well as increasing the satisfaction from marital life. The aim of this research is to understand the first intercourse experience of women of Sabzevar city Methodologies: this is a descriptive phenomenological study which was done through the purposive sampling, including interviews with 25 women in Sabzevar city with less than 5 years since their first marriage. The researcher helped participants with profound and semi-structured interview to determine their first intercourse experience. Data were analyzed using Colaizzi's method and Atlas Ti Software. Findings: Psychological changes (fear, psychological readiness of spouse, sense of relaxation after sex), vision and behavior changes (a sense of need for precise consultancy, gaining knowledge through modern means of communication, gaining knowledge through well experienced individuals, good manner of spouse), physical changes (pain, body irritation, the tearing of the hymen, lack of orgasm, the way of preparing, intercourse starter, the appearance of sexual partner, avoiding contraception tools)and cultural changes) are the focus of this study. Conclusion: Training the couples and modifying their beliefs and attitudes can increase sexual health as well as improving this experience. Understanding this experience can help policymakers to promote training courses before marriage.