Ceterosexual is a sexual orientation in which someone feels attraction specifically toward non binary people. It is distinct from orientations like heterosexuality or homosexuality, since those are defined in relation to the gender binary. Ceterosexuality centers non binary individuals and recognizes attraction to genders outside of male and female.
People who identify as ceterosexual may experience this attraction exclusively, or they may also feel attraction to binary genders but place a particular emphasis on their attraction to non binary people. For some, it is a way to clearly state that non binary genders are not an exception or side note in their attraction, but rather the main focus.
The term can exist alongside other identities. Someone might identify as both pansexual and ceterosexual, or they may use it as their primary orientation. It gives individuals language to describe attraction patterns that often go unnoticed or unnamed in mainstream discussions of sexuality.
Jay always knew they were not only attracted to men or women, but to people whose genders did not fit those categories. When they dated non binary partners, they noticed that their attraction felt the most genuine and consistent.
Discovering the word ceterosexual gave Jay clarity. It explained why their attraction did not quite match what their friends described when talking about being straight or gay. Identifying as ceterosexual helped them feel more confident, and it gave them a way to acknowledge and center their attraction to non binary people.
Source
https://new.lgbtqia.wiki/wiki/ceterosexual