Matthew- What do you think about the World War 2 catholic GI's who fell in love with european women and married them within a couple weeks of meeting them, and them brought them back to the US? This actually happened quite a bit.
I've read that the breakdown of sɛҳuąƖ morality (the acceptance of premarital sex) had two major phases before the late 60s.
This phenomenon was observed by looking at rate of illegitimate births.
One was between 1943-1946. The German magazine Signal had articles about American "Victory Girls" - young women encouraged to fornicate with GIs on furlough. The next period started in 1955 - around the advent of Rock and Roll music. It's pretty obvious that 50s youth culture - where young men take young women out on drives - where suburban house parties for teenagers are considered normal - is bound to end badly.
My old WWII Vet neighbor had an adopted son who had a house party when he was away. And he had to break up the house party of his grandson.
He grew up in the 30s. But he said when he was a boy such a thing would be totally unheard of. It shocked him - and he was a man who had a lot of experience of the world - seeing japs fried with napalm and the barracks where the "comfort girls" were kept. Interestingly he mentioned that when he saw two lesbians in a New York bar in the early 40s he told me he did not know that such a thing existed.
Times have changed drastically. And trads are deeply affected.