Definition The word Intersex has three common definitions: 1. The medical condition of being born with a body conforming neither to male nor female norms. 2. The medical condition of having both testicular and ovarian tissue present, so sex is indeterminate. 3. The medical condition of having a Disorder of Sexual Development. The term Intersex may be applied to any animal, or humans. Prevalence in Humans By definition (1), the prevalence is 1.7% By definition (2), the prevalence is 0.018% By definition (3), the prevalence is 1%