A while back I wrote about Yin & Yang and how some opposites are truly opposing (positive and negative) while others are actually the presence and lack of a thing (light and dark, for example). In that article I cited men & women as being genuine opposing pairs, as you can’t consider either one the absence of the other.
That, understandably, generated some comments. Many would not choose to see women & men as being opposites at all, but as two variations on the theme of human. I think that is absolutely correct. Our two human sexes have far more in common than they do in opposition. (And note that gender is a different concept than sex. Gender is about how your mind works, about who you are; sex is about your genetic code.)
And yet… Anyone who lives in the real world knows that the “Mars & Venus” thing has some substance.