I wouldn’t say all totalitarian regimes are hostile to sex and drug use. I think some totalitarian regimes are hostile to them because certain aspect of their ideology calls for it.
The current Chinese Fascists in charge have no ideology except power and control for themselves, so they are particularly flexible in the means of control. Right now their means of control has shifted from trying to convince everyone the nobility of Communism, to getting people hooked on sex and money, then assure them that as long as they do what they’re told they keep getting those perks.
A nation of amoral hedonists will never find the will or the courage to establish a just society.
Opium pipe Mr. Chang? Our dens are nice and clean, no bugs here sir!