Objective. In this study sexual differences are analyzed in relation to the experience of jealousy among young people and university students. Method. A non-experimental, descriptive, comparative study of a transversal nature was carried out. The sample consisted of 299 participants, 57.2% of whom were female and 42.8% male, who responded to forced choice questions designed by Buss, Larsen, Westen and Semmelroth (1992), with regard to the level of distress caused by emotional or sexual infidelity. Results. The female subjects presented a subjective experience of emotional jealousy when faced with possible infidelity on the part of their partner, higher than that of men with 77.2%. The males presented a subjective experience of sexual jealousy when faced with possible infidelity on the part of their partner, higher than that of females, with 32.8%. Conclusion. According to the evolutionary hypothesis, which explains the difference in jealousy from