U. S. World War II novels usually have two themes-anti-fascist and indictment of the modern power, and two battlefields-the fight against the enemy in the front line and the class struggle between the officers and soldiers in the rear line of battlefield. According to the characteristics of sexual politics, this paper studies the phenomenon of sex in these novels, and finds out that sex as the hidden battlefield and one kind of the writing strategies works for ideologies of the two lines and also implies the third front line threatening the sol...