"Gender identity - a person's internal deeply held sense of being either male or female" 1. This is already incoherent, because none of us have a basis for that comparison. We've all only been just the one gender, so we'd have no way of knowing the difference between "feeling like" a man vs. "feeling like" a woman, or indeed if such a difference exists at all. and 2. Frankly it doesn't matter what someone "senses" themselves to be. You're either male or female on the basis of biology. Much of this incoherence is due to people thinking of "gender" as something different from sex. It isn't, which is why the roles we're expected to play based solely on our biological sex are called "gender roles" to begin with. And indeed most of the offered definitions for "gender" today confuse it with gender roles and norms.