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There is no consensus whether ideal mate preferences are actually expressed in real choices or whether people choose partners according to traditional sex preferences or seek those similar to them. In order to address these questions, 267 Brazilian university students (120 involved and 147 not involved in a romantic relationship) participated in this study, describing themselves and their current or most recent romantic partner. As inclusion criterion, involved subjects must have been in a stable relationship for at least 12 months. Our results suggest that male choice reflects typical preferences based on Parental Investment Theory. On the other hand, the typical female preferences were not observed; instead, their choices indicate a preference for similar partners to themselves. Given that similarities are important to maintaining long-term relationships, females may adapt their preferences in order to ensure male investment in a long-term relationship. [ABSTRACT FROM AUTHOR]