Duosexuality is a sexual orientation where one identifies as two or more sexualities, or where one identifies as two or more sexualities that are fluid. An example would be abrosexual or gaybian.
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Abrosexuality - A sexual orientation where ones sexuality is fluid, much like genderfluidity but with your sexuality.
Gaybian - A sexual orientation where one identifies as gay (MNBLMNB) and lesbian (WNBLWNB), usually due to being multi gendered.