Let me take you back to 1918, when World War I camp hospitals overflowed with soldier-patients suffering from battle wounds, influenza, and gonorrhea. Long before the use of penicillin, venereal diseases weren t easy to treat and they were a major public health risk, both on and off the battlefield. They also impaired the efficiency of military action; the U.S. Army discharged over 10,000 men for infection with sexually transmitted diseases during World War I, and deferred many more draftees before they even joined up. 
Although German, French, and British troops in the War had been issued sheath prophylactics- condoms- in their kits as a matter of course, the U.S. had waffled on the policy, worried about the moral implications of such an action. Instead, they urged restraint. Only in 1918, faced with an enormous loss of manpower, did U.S. military policy change, allowing the distribution of condoms among servicemen as a disease preventative measure.
Things were changing on the home front, too. A 1918 U.S. court ruling legalized for the first time dissemination of condoms and other forms of contraception used for disease prevention, although only with a doctor s prescription. The growing profile of public health as a societal responsibility also resulted in the creation of new governmental bodies such as the Interdepartmental Social Hygiene Board, consisting of the Secretaries of War, Navy and Treasury and the Surgeon Generals of the Army, Navy and Public Health Service, as well as a new Division of Venereal Diseases within the Public Health Service.  Although the contemporary influenza and venereal disease epidemics were obvious influences on this increased concern and government action, it should not be forgotten that much of this advocacy was based on racist, classist, and ableist rhetoric and preconceptions tied to moral panic and the eugenics movement.
It took a little while for condom sales to take off back home, but by 1965, apparently 42% of Americans seeking contraception relied on this type of prophylaxis.  But it s important to note that these statistics and policies were compiled with only one type of sexual activity in mind: that of the heteronormative, penetrative variety, preferably between married people. They do not, did not, and never will tell the full story of American sexual experience or contraceptive effort (whether against sexually transmitted disease, pregnancy, or both).