Because without one, men would have gone ahead and done all the things they thought it was right to do. They would make all the wrong turnings without checking the map. They would spend all the money on something they thought it was right to spend on. They would even start to kill each other; and when men start to kill each other, there will not be many men left at the end of the day, much less for successful men. So that is why, there is, or rather, there has to be a woman behind every successful man.
Now I wonder why men is called “men” and women is called “women”, when I thought it should be the other way round. Men are simply incomplete without women.