…Which is to say the studios and production companies. What are we talking about? Glad you asked:

Chris Rock & Adult Movies – by Scott W. Smith (ScreenwritingFromIowa.Com)
“Most parts in comedy, they’re not written for men. They’re written for, like, boy-men. So it’s cool to play a man-man. They don’t make adult movies anymore. Go to a multiplex. If Sydney Pollack was around today, he’d be directing episodes of ‘True Blood.’”
Chris Rock
New York Times
August 5, 2012
“Film 2 Days in New York”
Interview with Dave Itzkof
Oh.Those kinds of “adult movies.” Grown-up ones. Not…you know. Dang. Not that we disagree with anything Chris is saying here. He’s one of funniest, brightest, smartest doods in the showbiz galaxy. But we have to point out that this situation doesn’t exist because writers don’t want to write for adults. All the writers we know actually do want just that. No, the situation exists because it’s what the studios want. They simply aren’t buying many men-men vehicles these days.