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Rationals (or “lefts”) are the logical and scientific sex; identified with masculine pronouns and producing a form of sperm. They have limited ability to pass through other bodies.
Emotionals (or “mids”) are the intuitive sex; identified with the feminine pronouns and provide the energy needed for reproduction. Emotionals can pass freely in and out of solid material, including rock.
Parentals (or “rights”) bear and raise the offspring, and are identified with masculine pronouns. Parentals have almost no ability to blend their bodies with others, except when helped by one or both of the other sexes.