Eh, I think you can get various axes on a biological sex spectrum even if you consider the the definition of biological sex: if someone has male gonads and XY chromosomes but has undergone sex reassignment surgery and is undergoing estrogen hormone replacement theory, would you still classify them strictly biologically male if they don't meet two of the four generally used criteria for sex? And in the case you don't believe that all those criteria should be used for determining biological sex, then that's another thing people need to agree on. I think characterizing biological sex as a spectrum can be a useful way of thinking it, but I think people end up dragging the culture war debate into it.