So someone asks for scientific evidence that biological sex is not a simple binary, got those sources, and you decide not to read them or even watch the very simplified video.
A quick summary. There are many genes that affect primary and secondary sexual characteristics. By your definition they all would have to be 100% male or 100% female. The fact that there are many studies showing otherwise is irrefutable evidence that though in most cases, these genes are aligned, there are enough cases of gene 'misalignment' both from random genetic mutations, fusion of different genes, or environmental factors that turn genes on/off that disprove your claim. And as I said, the obvious examples of hermaphrodites should have ended the conversation about what science says.