This research was aimed to investigate the level of extraversion in sex differences. It was an ex post facto design and independent t-test was used as the statistical test. This research included 32 male students and 48 female students from a university of Malaysia. The alternative hypothesis was female university students will report higher level of extraversion than male university students. However, the finding of the research revealed that there is not significance difference in level of extraversion between female university students and male university students. Hence, null hypothesis is failed to reject. This research allow society to break stereotype of personality in sex difference and fill a research gap sex difference of personality traits in multicultural country