During the past 15 years, the negative implications of the female gender role, as demonstrated by marital dissatisfaction and mental health problems, have been documented extensively in the social science, psychology, and feminist literatures. In this article, developmental and psychological assumptions about women that are fundamental to current marriage and family therapy practice are explored. The authors call attention to the absence of substantive knowledge about women's development and to the ethical risks associated with reliance on traditional gender role notions in work with female clients. Ethical guidelines for reducing bias in therapy, especially with couples and families, are offered to counselors and therapists for evaluation and refinement of professional gender role sensitivity.