Background and aims The phenomenon of Internet pornography (IP) addiction is gaining increasing attention in the popular media and psychological research. What has not been tested empirically is how frequency and amount of IP use, along with other individual characteristics, are related to symptoms of IP addiction. Methods 105 female and 86 male university students (mean age 21) from Calgary, Canada, were administered measures of IP use, psychosocial functioning (anxiety and depression, life and relationship satisfaction), addictive propensities, and addictive IP use. Results Men reported earlier age of exposure and more frequent currentIP use than women. Individuals not in relationships reported more frequent use than those in relationships. Frequency of IP use was not generally correlated with psychosocial functioning but was significantly positively correlated with level of IP addiction. Higher level ofIP addiction was associated with poorer psychosocial functioning and problematic alcohol, cannabis, gambling and, in particular, video game use. A curvilinear association was found between frequency of IP use and level of addiction such that daily or greater IP use was associated with a sharp rise in addictive IP scores. Discussion The failure to find a strong significant relationship between IP use and general psychosocial functioning suggests that the overall effect of IP use is not necessarily harmful in and of itself. Addictive use of IP, which is associated with poorer psychosocial functioning, emerges when people begin to use IP daily.