Since Christianity (and secular society) frowns on the practice of polygamy, how do you adjust for Solomon having a SLEW of wives? David? Moses?
You first must take into account the consequences of their actions. It's not like they "got away with it".
Let's flip this around a bit...
Moses: One wife, Zipporah.(Ex. 2:21)
David: His adulterous tendencies were his downfall...See: Bathsheba
Solomon: Solomon's many wives drew him into Idol worship.
And one more: Abraham endured spousal rivialry between Hagar and Sarah.
Now, on the flip side:
Noah: Called a "preacher of righteousness" [2 Peter 2:5], Noah was the only family head who was spared during the destruction of the Great Flood. He had but one wife.
Job: God called Job "My servant". Though Job was very rich and considered "the greatest man among all the people of the East", he had only one wife.
Isaac: The child of the promise had but one wife, Rebekah
Moses: Of all the Old Testament saints, Moses was the closest to God. He spoke to God face to face as a man speaks with his friend [Exodus 33:11]. Moses is also regarded as the greatest of the Old Testament prophets. God Himself even singled out Moses as a special prophet since He spoke to him face to face rather than revealing Himself in visions [Numbers 12:6-8]
Moses had only one wife, Zipporah.
Joseph and Mary: The Lord's earthly parents are a prime example of a monogamous relationship.
In summary, the lack of a specific rebuke by God is in no way to be taken as an acceptance or condoning by Him of the behavior.
