It’s not so hard to steal another man’s wife if you’re a king:
And Abner sent messengers to David on his behalf, saying, “To whom does the land belong? Make your covenant with me, and behold, my hand shall be with you to bring over all Israel to you.” And he said, “Good; I will make a covenant with you. But one thing I require of you; that is, you shall not see my face unless you first bring Michal, Saul’s daughter, when you come to see my face.” Then David sent messengers to Ish-bosheth, Saul’s son, saying, “Give me my wife Michal, for whom I paid the bridal price of a hundred foreskins of the Philistines.” And Ish-bosheth sent and took her from her husband Paltiel the son of Laish. But her husband went with her, weeping after her all the way to Bahurim. Then Abner said to him, “Go, return.” And he returned. (2 Sam 3:12-16; emphasis mine.)
Nevertheless, the New Testament encourages us to follow his example (Rom 4:4-8).