Léna NagyMónika KoósShane W. KrausZsolt DemetrovicsMarc N. PotenzaRafael Ballester‐ArnalDominik BatthyánySophie BergeronJoël BillieuxPeer Briken2026-03-222026-03-22202510.1177/10731911241312757https://doi.org/10.1177/10731911241312757https://andeanlibrary.org/handle/123456789/46298Citaciones: 6Sexual assertiveness (SA) is an important concept in understanding sexual well-being and decision-making. However, psychometric evaluation of existing measures of SA in diverse populations is largely lacking, hindering cross-cultural and comparative studies. This study validated the short version of the Sexual Assertiveness Questionnaire (SAQ-9) and examined its measurement invariance across several languages, countries, genders, sexual orientations, and relationship statuses among 65,448 sexually-active adults (<i>M_age</i> = 32.98 years, <i>SD</i> = 12.08, 58% women, 2.74% gender-diverse individuals) taking part in the International Sex Survey. The scale demonstrated adequate psychometric properties. Measurement invariance tests indicated that the SAQ-9 is suitable for comparing individuals from different cultures, genders, sexual orientations, and relationship statuses, and significant group differences were also noted (e.g., gender-diverse individuals reported the highest levels of SA). Findings suggest that the SAQ-9 is a reliable and valid measure of SA and appropriate for use in diverse populations, with specific populations exhibiting varying levels of SA.enPsychologyAssertivenessClinical psychologySexual behaviorDevelopmental psychologyarticle