The first is the love of beauty, which everyone has. The second-married widows around Cao Cao are known as Mrs. Du and Mrs. Yin. Mrs Du was Qin's wife, but Cao Cao took her away after defeating Lu Bu. Mrs. Yin was originally the wife of He Wei, and He Wei was the son of He Jin. Both ladies are as beautiful as flowers.
After Liu Bei captured Sichuan, he married the widow Wu. Wu was originally Liu Xie's wife, but she died widowed. Because Liu Xie is Liu Bei's cousin, Liu Bei refused to marry Wu at first, but Fa Zheng and others repeatedly advised Liu Bei to marry this nominal sister-in-law. After Liu Bei ascended the throne and proclaimed himself emperor, he named Wu empress.
Sun Quan also married a widow, Mrs. Xu. This Mrs. Xu was originally the wife of Lu Shang, who was widowed after her death. Sun Quan married her as his concubine, and Mrs. Xu was one of Sun Quan's two favorite wives. After Sun Quan became emperor, Mrs. Xu was made a princess.
The second is to get more support. In order to get the support of blades, Cao Cao married the Yin family. Liu Bei married Wu in order to gain the support of Yizhou school represented by Fa Zheng and Wu Yi. Sun Quan married Mrs. Xu in order to get the support of the Xu family, a strongman in Wu County. The support of these noble families made their rule more stable and their supporters benefited a lot. This is a win-win combination, which is the result of strong alliance!
For these heroes, as long as it is good for them to fight for the world, whether she is a widow or not, she will marry home. Their marriage is not for loving children, but more for politics, which is why they can achieve great things. As the saying goes, those who can achieve great things are informal! This is also one reason why they can get more in their lifetime.