Modern psychiatry and psychotherapy have historically been shaped by an androcentric perspective, generalizing men’s experiences to all individuals. This has led to the pathologization of non-normative identities and behaviors, such as homo/bi/asexuality and trans people. Incorporating a sex/gender-sensitive approach into clinical practice must begin with research that takes into account sex (biological traits) and gender (social roles and identities), recognizing both as complex, non-compartmentalized concepts and sometimes fluid concepts. The inclusion of sex and gender in research and therapy has only recently gained momentum, particularly through the lens of intersectionality, which examines how gender interacts with other identity factors such as race, social class, age, ethnicity, (dis)ability, or sexuality. This book seeks to critique current practices in psychiatry and psychotherapy and to propose gender-inclusive, evidence-based alternatives.