It is natural for a man to protect and take care of his family. Providing for his children and spouse is the main responsibility and every man wants to feel responsible for being a good leader. If a man marries a dominant woman, he will be competing with her trying to see which one out of the two is stronger. Marriage is not a contest and you should not feel tension. A shy girl will never make you prove you are stronger than her. Your ego will not suffer and you will feel more masculine with such a wife.