The objective of this dissertation was to provide tools for research on sexual assertiveness in Brazil. To this end, two studies were conducted. The first was a systematic review searching for randomized clinical trials with an intervention with an outcome in sexual assertiveness, and their main characteristics and factors that would most impact this result. Ten reviewed studies were returned, with nine different interventions and involving 1,285 participants in total. A meta-analysis showed that compared to the control group, all experimental interventions were effective, whether studies exclusively with American adolescents or with Iranian adults, the latter group presenting high heterogeneity in their results. The second study aimed to investigate the psychometric properties of the Sexual Assertiveness Scale for Brazilian women. A cross-sectional study was conducted with 1,031 women, including women who had recent sexual intercourse and others who had not. We found that the instrument is psychometrically acceptable has good adjustment indices, and did not present a difference in response in these two groups of women. It is thus evident that sexual assertiveness is a social skill with several benefits to sexual autonomy, therefore integrating and expanding its development in Brazil can have a positive impact on the sexual health of the population, in addition to having a measure that can be replicated in studies and clinical practice, verifying these changes in sexual assertiveness.