Mens adherence to constraining male gender norms can lead them to resist contraceptive use. Very few interventions have attempted to transform masculine norms to encourage greater contraceptive acceptance and gender equality. We designed and evaluated a small-scale community-based intervention targeting the masculine norms tied to contraceptive resistance among partnered men (N = 150) in two western Kenya communities (intervention vs. control). Pre-post survey data fit to linear and logistic regression models evaluated differences in post-intervention outcomes, accounting for pre-intervention differences. Intervention participation was associated with increases in contraceptive acceptance scores (adjusted coefficient (aβ) 1.04; 95% confidence interval (CI) 0.16, 1.91; p = 0.02) and contraceptive knowledge scores (aβ 0.22; 95% CI 0.13, 0.31; p < 0.001) and with contraceptive discussions with ones partner (adjusted Odds Ratio (aOR) 3.96; 95% CI 1.21, 12.94; p = 0.02) and with others (aOR 6.13; 95% CI 2.39, 15.73; p < 0.001). The intervention was not associated with contraceptive behavioural intention or use. Our findings demonstrate the promise of a masculinity-driven intervention on increasing mens contraceptive acceptance and positive contraceptive involvement. A larger randomised trial is needed to test the effectiveness of the intervention among men as well as among couples.

Male partner resistance is identified as a key factor that influences women's contraceptive use. Examination of the masculine norms that shape men's resistance to contraception-and how to intervene on these norms-is needed. To assess a gender-transformative intervention in Kenya, we developed and evaluated a masculinity-informed instrument to measure men's contraceptive acceptance-the Masculine Norms and Family Planning Acceptance (MNFPA) scale. We developed draft scale items based on qualitative research and administered them to partnered Kenyan men (n = 150). Item response theory-based methods were used to reduce and psychometrically evaluate final scale items. The MNFPA scale had a Cronbach's α of 0.68 and loaded onto a single factor. MNFPA scores were associated with self-efficacy and intention to accept a female partner's use of contraception; scores were not associated with current contraceptive use. The MNFPA scale is the first rigorously developed and psychometrically evaluated tool to assess men's contraceptive acceptance as a function of male gender norms. Future work is needed to test the MNFPA measure in larger samples and across different contexts. The scale can be used to evaluate interventions that seek to shift gender norms to increase men's positive engagement in pregnancy spacing and prevention.