7. World War I
Latex was invented in 1920, and with it came something similar to the condom as we know it today. During World War I, the United States and (initially) Britain were the only countries in Europe who did not provide condoms to their soldiers, and by the end of the war there were almost 400,000 documented cases of syphilis and gonorrhea in the American military. U.S.A.!

8. World War II
During World War II, the U.S. military hopped on the bandwagon and distributed condoms to male soldiers. They also coined fun safe-sex slogans like this gem: "Don't forget — put it on before you put it in."