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Background: The Sexual Activity Questionnaire (SAQ) has been used in several trials of gynecological diseases and breast cancer, but normative data are lacking. The SAQ is the first patient self-administered questionnaire used to assess female sexuality in Norway, and we wanted to examine the psychometrics of the SAQ, reasons for sexual inactivity, and scorings on the SAQ function scale (SAQ-F). Methods: From public official address lists 2800 women aged 20–69 years were invited to take part in an anonymous questionnaire study, including the SAQ. Altogether 1165 women (42%) responded, and the response rates varied with age. Descriptive statistics and principal component analysis (PCA) of the SAQ were performed. Results: PCA confirmed a three-factor structure of the SAQ-F: habit, pleasure, and discomfort from sexual intercourse. The internal consistency of the SAQ-F showed a Cronbach's coefficient alpha of 0.86. “No current partner” was the main reason for sexual inactivity in all age groups. Tiredness as a reason for nonactivity was a significantly more cited cause among women in the age group 35–55 years compared with the younger and older groups. The prevalence of pleasure from sexual intercourse dropped significantly with increasing age. Normative findings on the SAQ-F are presented as percentiles in relation to age groups. Conclusions: The SAQ is a short and discrete screening tool for sexual function, with good psychometric properties. Changes with age as to pleasure, habit, and discomfort confirmed construct validity of the SAQ-F, and the findings were used to produce age-related percentile scores of the SAQ-F considered helpful for clinical practice. [ABSTRACT FROM AUTHOR]