This study established the validity and factor structure of the Affirmative Training Inventory (ATI; T. S. Carlson, C. R. McGeorge & M. Rock, unpublished) as a measure of lesbian, gay, and bisexual (LGB) affirmative clinical training. Additionally, this study examined the latent associations among the subscales of the ATI and the Sexual Orientation Counselor Competency Scale (Bidell, 2005) utilizing a sample of 248 master’s and doctoral couple and family therapy students. The findings from this study provide empirical support for the relationship between specific classroom-related content associated with LGB affirmative therapy and students’ perceptions of their own ability to work competently with LGB clients. This study also found a positive association between the degree to which couple and family therapy programs adopt a LGB-affirmative stance and students’ beliefs, knowledge, and skills associated with competent therapy with LGB clients.