The aim of this study was to determine type and frequency of online sexual practices among Spanish college students, prevalence of risk and pathological cybersex use profiles, and correlates/predictors of this behaviour. Participants were 1,557 males and females between 18 and 25 years old. Results showed that cybersex use is not as frequent as that documented in other Western countries. However, a significant percentage of participants with a risky (9%) or pathological (1.7% in men and 0.1% in women) profile was identified. Finally, we found a set of variables that, in interaction with gender, explains 58% of the variance for cybersex addiction scores.