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It’s a reference to an old Greek comedy called Lysistrata from 411 B.C. The gag was, in order to end the Peloponnesian war (460 B.C.), women colluded to refuse sex until the men come to their senses and stop the war.
https://en.m.wikipedia.org/wiki/Lysistrata
Sex strikes have been used more recently as well to end gang conflicts, wars, and other violence.