Although paternal incest has been well documented and studied, there is very little research on maternal incest, and victims rarely seek help. New clinical evidence suggests that maternal incest occurs at a much higher rate than previously thought. Estimates indicate approximately 5% of sexually abused girls and 20% of sexually abused boys have been victimized by women perpetrators. Myths that discourage the acceptance of male victimization are compounded by the idea of mothers as caregivers and nurturers. The societal taboo surrounding maternal incest can be particularly damaging to victims, resulting in guilt and shame. The attitudes of mental health professionals in regard to myths about maternal incest can promote conditions that either encourage or discourage men or boys from opening up about this type of abuse. This article reviews the prevalence and dynamics of maternal incest, the shame felt by victims and its consequences, treatment approaches, and areas of future research needed.