Every other subject gets whacked by the politicaly correct crowd.
Only assholes use the term "politcally correct."
maybe because sex is one of the last forbidden areas in the US.
People who use the term "politically correct" are usually old white people who don't understand why they can't use the n-word anymore.
Comedies don't actually have much to do with sex these days. Excrement is more the rage.
Sitcoms are. The comedy-drama scripts of yesteryear that were so entertaining (Maude, All In The Family... hell, even The Facts of Life) are beyond today's hipster writers.
Now just snarky bits about bedhopping and menstruation.
Mom is pretty sexual.
No screwball because it's too much of a liability.
No nonsensical wit because it requires too much attention.
They still provide the fool, but it's become extremely drawn out.
There's always silliness, but audiences believe they are too mature to enjoy it. They get their fix of silliness through memes now.
Now that everyone can see porn, sex is the next taboo to be destroyed as a comedy device.