I'm new here so I did not see your question until a year after you posted it. Sorry nobody bothered to reply so I'll give an answer in case this question comes up in a future search. It is safe to say the number of swingers or folks in open relationships numbers in the millions worldwide.
Even in countries like Egypt where that kind of behavior is illegal and punishable by death, folks get caught swinging. Here in Canada, with a very small population we have over 80 swingers clubs listed and in the US there are hundreds of swingers clubs. Each of these clubs gets a few new members every week so you do the math....that's a lot of sexy like-minded people.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.