Hmmm, found this already:
Now granted this was from WW1:

In World War I the venereal infection rates of the British army were seven times higher than the Germans, principally because national prudery prevented the British high command from acknowledging that there was any problem at all until 1915, when the Canadian and New Zealand prime ministers forced the chiefs of staff to issue free contraceptives to the troops.

http://www.psywarrior.com/PSYOPVD.html