In Christian teaching, we are taught that God created Adam and Eve in pairs, there is no other woman besides Eve which is God's creation. Therefore, tradition outside Christianity for Christians should not be a reference to marry more than one woman.
For the marriage itself is very holy, and only holiness itself belongs to God. We are also taught that our bodies are the temple of God's holiness, so do not pollute our bodies for the sake of worldly satisfaction, but direct our purpose to the creator of the universe