During the World Wars, many spouses were split up. Men were often in tight quarters with each other, often not seeing women for long periods of time. Women often worked in factories alongside one another and in many countries most eligible men were at war. This leads me to believe that human urges took over and more homosexuality occurred during the World Wars. I can't seem to find much on this though. Does my hunch have any truth to it?
It has been a very long time since I've read this so I can't comment on its particulars, but I do remember something of this issue being addressed in:
You should check out this pretty good documentary about gay men in the Canadian military called Open Secrets.
It contains direct interviews with men that served during WWII, ranging from closeted officers to privates that performed as drag queens (for official entertainment!).