Of Plurality of Wives

We must now consider the plurality of wives. Under this head there are five points of inquiry:(1) Whether it is against the natural law to have several wives?(2) Whether this was ever lawful?(3) Whether it is against the natural law to have a concubine?(4) Whether it is a mortal sin to have intercourse with a concubine?(5) Whether it was ever lawful to have a concubine?

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Whether it is against the natural law to have several wives?
Whether it was ever lawful to have several wives?
Whether it is against the natural law to have a concubine?
Whether it is a mortal sin to have intercourse with a concubine?
Whether it was ever lawful to have a concubine?