Refinery29 tackles the binary and cites Robyn’s definition of bisexuality in this article about what “Bisexual” really means for the community.
Bisexual isn’t an outdated term, because it doesn’t actually reinforce the gender binary at all, and much of the confusion around the term is rooted in misunderstanding. In fact, non-binary understandings of bisexuality have been around at least since at least 1990 (see Bisexual Manifesto), though they were not then in widespread use. Currently the most popular definition, developed more than a decade ago, is one that includes everyone. It was crafted by famed bisexual activist and editor of the Bi Women Quarterly