I've always heard 'bisexual' to mean several things depending on the person, like it could be 'same and different genders' or 'two gender ids, maybe female and agender attraction, or polygender and male attraction', or attracted to (two/sameother) different genders in different ways (attracted to x,z,v in y, and a,z,c in b, cont. etc.), while pansexual is attraction to all genders (similar to first bisex def), possibley with being attracted to the same things in all genders. sorry for grammar

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