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This study investigated the influence of gender and infidelity, as well as the role of distance, on jealousy between dating partners. One of eight scenarios describing infidelity between a dating couple was randomly presented to 277 undergraduate college students. Participants then completed a questionnaire about perceived jealousy in the scenario, their attitudes about sex, and their relationship history. Gender and infidelity type had strong effects on perceived jealousy. Furthermore, participants who had experienced sexual infidelity had higher levels of jealousy than those who had never experienced infidelity. Unexpectedly, participants who reported they had been in a long distance relationship reported higher levels of jealousy than those who had not dated long distance.