Sex and Propaganda explains the failed attempts to demoralize the enemy in WWII — through pornography:
Both the Axis and the Allies printed aerial propaganda leaflets using sexual themes in an attempt to demoralize enemy soldiers at the front. Did these leaflets work? Did the finders become emotionally crippled and unable to carry on their duties and responsibilities? Just the opposite occurred. The ‘pin-up’ pictures became collectors items sought after by the troops who greedily collected and swapped them. If anything, the leaflets raised morale. There is no doubt that they were the most heartily appreciated propaganda leaflets used in World War 2. We can probably state that they were the most widely read and circulated enemy documents of any war.