For Theoretical Weekends Scission takes a look at sex. Really! A communist theory of love and sexuality, I bet Lenin didn't write this. Alexandra Kollontai did. She was always such a thorn in his side.
Kollontai argued,in favor of carrying out ideological struggle over the structure of gender and sexual relations simultaneously with the social and economic struggles. She attempted a materialist analysis of the historically varied forms of love and sexuality and their relationship to class and class struggle.
Tansy Hoskins writes at CounterFire:
Alexandra Kollontai was a Russian revolutionary who wrote extensively on women's rights. In her 1921 essay ‘Sexual Relations and the Class Struggle’ Kollontai identifies three obstacles to sexual freedom. The first obstacle is the extreme individualism that exists in capitalist society which leads to people to try and find “themselves through another person.” The second obstacle is the belief that people in relationships have the right to possess each other and the third obstacle is the acceptance of inequality of the sexes in terms of physical and emotional experience.
Keep in mind that this stuff was written over ninety years ago.
I present you then, from the Marxist Internet Archive, Sexual Relations and the Class Structure.
Sexual Relations and the Class Struggle
Translated: by Alix Holt, 1972;