It really is an apples-to-oranges comparison, rather than "two populations of apples with different mean weight".
For example, the _function_ of sex-segrated bathrooms is to _protect females from males_, where "females" and "males" are natural clusters in configuration space that it makes sense to want words to refer to.
+
+all I actually want out of a post-Singularity utopia is the year 2007 except that I personally have shapeshifting powers