should read Jesus was conceived without any sperm...sorry
On the contrary, the penalty subsequently laid down in the law of Moses for a simple refusal to comply with the levirate marriage precept was only a relatively mild public humiliation in the form of a brief ceremony of indignation. The childless widow, in the presence of the town elders, was authorized to remove her uncooperative brother-in-law's sandal and spit in his face for his refusal to marry her.
So it was not his refusal to provide offspring for which the Lord took his life, but his coitus interuptus.
5 "When brothers live on the same property [a] and one of them dies without a son, the wife of the dead man may not marry a stranger outside [the family]. Her brother-in-law is to take her as his wife, have sexual relations with her, and perform the duty of a brother-in-law for her. 6 The first son she bears will carry on the name of the dead brother, so his name will not be blotted out from Israel. (A) 7 But if the man doesn't want to marry his sister-in-law, she must go to the elders at the [city] gate (B) and say, 'My brother-in-law refuses to preserve his brother's name in Israel. He isn't willing to perform the duty of a brother-in-law for me.' 8 The elders of his city will summon him and speak with him. If he persists and says, 'I don't want to marry her,' 9 then his sister-in-law will go up to him in the sight of the elders, remove his sandal from his foot, and spit in his face. Then she will declare, 'This is what is done to a man who will not build up his brother's house.' 10 And his [family] name in Israel will be called 'The house of the man whose sandal was removed. (C) -Deuteronomy 25:5-10