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Part of the boom was due to early marriages, but I agree with this excerpt that the most important factor was something you can't easily measure: people were just having an awful lot of sex before the Pill.pic.twitter.com/P5aONRNSLp
World War II occupies a prominent place in histories of homosexuality, the time when a lot of guys realized they weren't the only one. Widespread exposure to prostitutes seemed to have a similar effect on heteros, causing them to come home with different expectations.
