While getting a degree in History in the 70s, most of my professors bought into the shared importance of Marx and Freud.
https://en.wikipedia.org/wiki/Freudo-Marxism
Marcuse, Fromm, and Foucault were the Big Thinkers of the day. Some of my professors also liked Wilhelm Reich — but he wasn’t officially “cool” because he was a little crazy, thought he could cure cancer, and died in a US federal prison. Reich also got kicked out of the Communist Party, which was certainly his biggest sin.
But basically, unleashing anything-goes sexual desires to convince people that morality, family and private property were weird, backwards, Christian ideas ... that was surely the path to Utopia.
And we seem to have make little progress.
Oh, yeah. Foucault had a rather interesting set of sexual preferences himself, involving whips, chains, and death from AIDS. Marcuse is simply another example of someone who uses politics to get laid.
Anyone who looks into the genesis of the Nazi party runs straight into sexual perversion from the outset. Pictures of the Hitler Youth were, and remain, borderline softcore pornography. Out-of-wedlock pregnancy was openly encouraged in Hitlerjugend camps, and lebensborn cannon-fodder baby factories are something out of a nightmare. A very great deal has been written on Rohm and the SA, whose orgies would be right at home in a San Francisco bath-house. A big one. Hitler himself was accused by political opponents (so take it with a grain of salt) of supporting himself through male prostitution in his Vienna days. At the very least he was very familiar with that environment, and yet his shock at the degree to which the SA had wallowed in it was apparently genuine. It provided a handy excuse for the Night Of The Long Knives, to be sure.
I think it's another facet of the failure of the popular argument that the Nazis and the Communists were any sort of opposite when they behaved so very much alike in so many respects. Totalitarian statism, camps, mass extermination, rigid thought control, militaristic regimentation of society, they were two peas in a pod.