We must now consider the plurality of wives. Under this head there are five points of inquiry:

A1 Whether it is against the natural law to have several wives?

A2 Whether this was ever lawful?

A3 Whether it is against the natural law to have a concubine?

A4 Whether it is a mortal sin to have intercourse with a concubine?

A5 Whether it was ever lawful to have a concubine?