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Objectives This study aims to develop and test the construct validity of the new concept of “Sexualized Body Perception,” which measures both the relationship that women have with their bodies in sexual situations and the way in which they consider different parts of their bodies on a physical level. In addition, we investigated whether this new construct mediates relationships between different items relating to the body as presented in several scientifically validated questionnaires, and women’s sexual self-esteem. Methods After carrying out various correlative analyses, a principal component analysis allowed us to define relationships to the sexualized body. We then posed a series of hypotheses to evaluate the possible mediating or moderating effect of Sexualized Body Perception between the different items in our questionnaire and female sexual self-esteem. Results Our results highlighted the mediating role of “Sexualized Body Perception” in the relationship between age and sexual self-esteem among women, as well as a moderating role in the relationship between the SATAQ scale and sexual self-esteem among women. Conclusions This study shows the critical importance of “Sexualized Body Perception” in women’s sexual self-esteem, beyond factors related to BMI and, interestingly, those related to age. Finally, this paper also shed light on potential new interventions aiming to improve women’s sexual self-esteem.