To learn more about the history of romantic love and marriage, read Marriage, A History: How Love Conquered Marriage by Stephanie Coontz. This acclaimed scholar is a 40-year historian and professor at one of the most radically progressive colleges in America. I don’t agree with her on many things, but she is one of the foremost experts on the history of marriage.

You don’t have to buy all of the conclusions she draws from the facts, but you aren’t likely to find a better summary of the history of marriage and the evolution of romantic love.