@ahltorp
Definitions are what happens when people put an identifier to a fact or observation. We saw male and we saw female, so we got a word for it.
All this said, the fact that you can (by biological error) have a mix of sex characteristics does yield a sort of spectrum. I see that. The problem is with what I said earlier, about what the word "sex" means. That, and the biped-related thing I mentioned where these errors are considered exceptions, not part of the rule.