Binaryfluid is a term for when one is genderfluid, but only between the binary genders. For some people they may suddenly change between man and woman, with little to no transition between them. For others they my smoothly most between them, sometimes being a man, sometimes a women, and sometimes in between (androgyne). It may also include feeling like a demiboy and/or demigirl and feeling both male and female at the same time (bigender).
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