God was not pleased with harems or polygamy, for it was not his intended purpose for a man and a woman, but as Jesus says, some things were allowed because of the hardness of their hearts. Jesus has raised the standard, in that, since the Holy Spirit is indwelling, we die to ourselves and our "selfishness" and love others by following the Holy Spirit. No man, if they possess the Holy Spirit should desire to hurt their wife by desiring to marry another.
Even though there are some men that defend polygamy, in every instance from my experience, they never desired to be in such a relationship themselves.