(Emphasis original)

Sexual marxism is a loosely-defined concept used by some incelism-oriented cybercels that usually dwells on the "redistribution of sex" in a timeframe shorter than the thousands of years of evolutionary time required to change people's natural sexual proclivities. Sexual marxists tend to advocate for a "redistribution of sex" that does not involve men transferring any money to women. See the Complimentary Heterosexual Affections Directive (Submitter’s note: Roosh Vile’s proposal for helping incels; see here) as a proto-sexual-marxist idea. A full-on sexual marxist idea would be a covert government program to societally brainwash people to make incels more attractive to women. We already undergo a tremendous amount of cultural brainwashing and attribute that brainwashing to our "own choice". Sexual marxism would just change what ideas are fed to people. Sexual redistribution discussions tend to hinge upon the topic of liberty.

Sexual marxism has been advocated in academia, and also by women, although not under the term, 'sexual marxism'.
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Opposition

Those that oppose Sexual Marxism are neoliberals and sexual trad-cons. Some blackpillers have mixed feelings on sexual marxism, but do not believe it is possible, so they don't dwell on it much, or they make fun of it.

image
Four squares divided by double-headed arrows, each holding an image with text overlaid. The left and right heads of the horizontal arrows are labelled “economic-left” and “economic-right”.
Top left: Soviet propaganda placat, with a happy couple in the foreground - “>state-mandated gf”
Top right: A crude drawing of a bald man - “>no gf”
Bottom left: An anime character with animal ears coming out of their hair goofing into the ‘camera’- “>becoming the gf”
Bottom right: Auction of a female slave - “>buying gf”