Pornography viewing is gradually becoming a part of life in many countries around the world, including Nigeria. However, the role of the extensive consumption of pornography among the Nigerian youths has not been given much attention in the investigation of HIV risky sexual behaviour in Nigeria. This study examines the predictive strength of pornography viewing and gender differences on HIV risky sexual behaviour among university students. Using a survey design, 596 university students were selected from 12 departments across three faculties, with simple random technique. A questionnaire focusing on socio-demographic profile and HIV risk behaviour scale (r=0.81) was administered to the participants. Data were analyzed using descriptive statistics, correlation analysis, t- test and regression analysis at 0.05 level of significance. Two hypotheses were tested. The results revealed that pornography viewing and gender differences jointly and independently predicted HIV risk behavior (R2 = .18; F = 59.01; p<.01). Pornography viewing is crucial for a comprehensive examination of HIV risk behaviour.