Numerous findings in the subject of criminology have established that males, in contrast to their female counterparts, have a higher level of incidence and are more prevalent in deviated behavior. Explaining the gender gap in this deviation has been a challenge for modern criminology. The first attempts to explain the deviation in the gender-behavior relationship were attributed to the Women’s Liberation Movement. Since the appearance of feminist explanations regarding the relation between gender and criminal behavior in the sixties, up to the present, there has been a plural texture of arguments regarding this relationship. This article has various objectives. In the first place, the authors refer to the first feminist manifestations in criminology, within the framework of the gender gap phenomenon. It is indubitable that, to understand the current treatment of gender/sex in this science, it is necessary to review the contributions and claims of the earliest and most orthodox feminism. In the second place, this study will try to summarize, from a theoretical and researchal perspective, the status of gender in the current discussion regarding the etiology of criminal behavior. It is also useful to point out that the concern for this variable does not exclude feminism in any of its forms; also, traditional criminology has been interested in its approach and comprehension. Finally, some epistemological and methodological considerations are offered to those Spanish-speaking criminologists who are interested in introducing the gender perspective in their research on the etiology of criminal behavior.