In the Communist Manifesto, Marx uses the lens of class struggle to help us see how women's lives have been shaped by their place as an underclass within a class (the proletariat), since most of the labor performed by women is underpaid or unpaid care work (including sex work). Marx isn't sure if there are any genuine differences between men and women, differences that would exist no matter what kind of society existed. He thinks a lot of female behaviors are actually survival mechanisms for getting through class struggle rather than fixed differences.
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Women experience class struggle very differently from the way men experience it.
Women experience class struggle in mostly the same ways men do.