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Suppose the oral contraceptive was perfected after WWI. The female:male ratio in Europe was disproportionately high due to the war. IOTL this was a period of unprecedented social and sexual liberation. One would imagine the times would favor a sexual revolution comparable to the 1960s should the contraception technology become available.
Women's rights would be greatly boosted with women controlling their reproductive destinies. Perhaps chivalry would take a dive earlier.
More men get laid, less political extremism in the 30's?