It's part of the western left cognitive dissonance. They reject the policies of every AES (actually existing socialist) state, refuse to understand or engage with them, and think that they know better. Pretty much every AES state has placed legal limits on sex work/prostitution and drugs, as well as other excesses and hedonistic behaviour. This was not done because of "authoritarianism", but because of the material conditions that occur during the long walk from capitalism to socialism,

For example, prostitution, pornography, and almost all recreational drugs are currently illegal in China today. Same with Vietnam. Same with Cuba. Same with Laos. Same with the DPRK. Literally every actually existing socialist state has policies restricting these activities, even those with socially progressive policies like Cuba.