Abstract
This perspective asserts the existence of only two sexes/genders, male and female, based on not only biological and reproductive processes but also from claims of non-binary or transgender identities as defined through negation which rely on the binary concept of sex/gender. Thus, individuals claiming identities on the "gender/sex spectrum" are again defining themselves through negation (definiens per negationem). This perspective suggests that the diversity of gender experiences, (the sex or gender spectrum) is defined by what individuals are not rather than what they are. While the validity of non-binary and transgender identities definiens per negationem is noted, it is important to accept the reality of the binary nature of sex or gender as a scientific fact, and that all human beings are on a developmental pathway leading to either male or female. Without the reality of binary sex or gender, the gender identity spectrum does not exist as there is nothing to negate from.