One's own self is begotten on one's wife and therefore wife is called Jaya. A wife should also protect her husband, remembering that he would take his birth in her womb.
आत्मा हि जायते तस्यां तस्माज्जाया भवत्युत। भर्ता च भार्यया रक्ष्यः कथं जायान्ममोदरे॥