That seems a bit one-sided to me. I think it is fair to say that the sexual division of labour pre-capitalism, though stultifying, is not oppressive, in that neither sex had rights or autonomy. The initial sexual division of labour under capitalism, by contrast was profoundly oppressive, taking a natural distinction and giving it a new content of social oppression.
On the other hand, recent developments see the formal oppression of women dismantled (universal suffrage, property rights, equal pay legislation etc.); and furthermore, the most significant social change in the twentieth century has to be the improvement of women's social position. I used to be of the opinion that women's equality was unattainable under capitalism. But it seems to me that women have a better social standing under capitalism - at least in the developed world - than they did under pre-capitalist social relations.
As to homosexuality, as much as its oppression was an event of capitalism, so too has been its possibility and its liberation. There may have been same-sex relations before capitalism, but there was not such a thing as a homosexual identity. (see Ken Plummer, Greek Homosexuality)
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-- James Heartfield