Since the Jewish law allowed polygamy, David’s conduct in following - what has been said to have been - physician’s advice, was blameless.
Related Commentaries of 1 Kings 1:2
1 Kings 1:2
2 Wherefore his servants said unto him, Let there be sought for my lord the king a young virgin: and let her stand before the king, and let her cherish him, and let her lie in thy bosom, that my lord the king may get heat.