Interesting. My talks (at least with older people who went to college) have given me quite a different perspective - where people would typically marry very you

Interesting. My talks (at least with older people who went to college) have given me quite a different perspective - where people would typically marry very young (often out of college), and no one would even think of having sex without at least being engaged. I don't doubt the truth of this story (though there is certainly hyperbole); rather I find it hard to believe that 'sleep with' in this context actually means 'sex'. The main flags are A) Feynman is discussing with other people about it (afaik not acceptable socially then) and B) a sexual one-night stand would be even less so. Finally I wager that the teen birth rate drop is solely due to an increase in education and contraption (and even legalized abortions). Obviously, there were some teenagers having sex in the 1940s (with a much higher liklihood of becoming pregnant right now), but, due to the risks and less acceptance than now, the rate was lower.