Everyone is discussing semantics, and no one is mentioning that the bible creation of the woman was mistranslated and the word that was translated into "rib" actually means something closer to "appendage", and the only bone that is missing in men is actually the phallic bone when compared to other mammals, men and women have the same number of ribs.

Edit: PS: I don't actually take the bible's story seriously but think it's an interesting and funny fact.