id argue thats a disorder of sex development. They tend to be more one way or the other E.G having non-functioning testes which is usually discovered through puberty. theres also specific genetic mutations we can link to being intersex such as a mutation of the FGFR2 gene. Theres also links to pesticides from several studies but i don't believe its the primary cause.

I'd consider this more of genetic variation within the sex rather than a separate sex itself. There are only two types of sex chromosomes: X and Y. They are almost always correctly matched together (XX or XY) but there are cases of a genetic mishap and an XXY, XYY, XXX, or something else. My general thought is: Presence of one or more Y chromosomes = male No presence of X chromosomes = female I don't think there are more than two sexes. People with one of these combinations (not XX or XY) may have atypical physical, hormonal, and mental features and be at higher risk for some types of diseases but this shouldn't be grounds for discrimination.