Well, the birds, at least.
There are several ways to interpret this answer. Choose your own adventure! Are you an optimist or a pessimist?
Optimist: You can't subtract a woman from a man, because without his woman, a man is nothing.
Pessimist: Men and women are incompatible, will never get along, and both are doomed to stunted and unfulfilled relationships.
Okay, both are kinda pessimistic, but one is much more so.