The objective was to study the effect of lying on the relationships between heterosexual college students. It is a descriptive research, cross-sectional design and probabilistic sampling. Participated 503 university students, aged 16 to 22, Average of 3.7 and D.T. Of 1.4. The "Questionnaire for the recording of the effects of lying situations in the couple relationship", designed by the authors, was applied after validation. The results were processed using the Office Excel program. Statistical analysis included frequency distributions, correspondence analysis between variables and implied analysis according to the Rasch model. It was found that 94% of the women and 96% of the men had implicit lying experiences and that the intensity of discomfort in the women was 19% higher than in men. The most frequent immediate behavior was Complaint, which was associated with the Enhancing and Distancing effect; And, Chat, which was associated with the Improve relationship effect. It is concluded that the lie has no destructive effects on the relationship, and is likely to contribute to the construction of better relationships. It is recommended to continue with other studies guaranteeing greater anonymity when responding to the instruments, for greater objectivity [ABSTRACT FROM AUTHOR]