Background and aimsCompulsive sexual behavior is characterized by extensive sexual behavior and unsuccessful efforts to control excessive sexual behavior. The aim of the studies was to investigate compulsivity, anxiety and depression and impulsivity and problematic online sexual activities among adult males and females who use the Internet for finding sexual partners and using online pornography.MethodsStudy 1- 177 participants including 143 women M = 32.79 years (SD = 9.52), and 32 men M = 30.18 years (SD = 10.79). The Sexual Addiction Screening Test (SAST), the Yale-Brown Obsessive-Compulsive Scale (Y-BOCS), Spielberger Trait-State Anxiety Inventory (STAI-T STAI-S) and Beck Depression Inventory (BDI). Study 2- 139 participants including 98 women M = 24 years (SD = 5) and 41 men M = 25 years (SD = 4). The impulsivity questionnaire (BIS/BAS), Problematic online sexual activities (s-IAT-sex) and Sexual Addiction Screening Test (SAST).ResultsStudy 1- Multiple regression analysis has indicated that a model which included BDI, Y-BOCS, and STAI scores contributed to the variance of sexual addiction rates, and explained 33.3% of the variance. Study 2- Multiple regression analysis indicated that BIS/BAS and s-IAT scores contributed to the variance of sexual addiction rates, and explained 33% of the variance.Discussion and conclusionsObsessive-compulsive symptoms contributed to sexual addiction among individuals who use the Internet for finding sexual partners. Impulsivity and problematic online sexual activity contributed to ratings of sex addiction. These studies support the argument that sex addiction lies on the impulsive-compulsive scale and could be classified as a behavioral addiction.