"It's one of these dirty little secrets that everyone knows about."

My dirty little secret is that I liked these people.

And, of course, I know all their dirty little secrets too.

In the theater business, this is actually a bit of a dirty little secret.

It is the dirty little secret of the political class.

It's the dirty little secret we don't like to discuss.

"The most important thing is that this has not been a dirty secret," she said.

Class, it has been said, is the dirty little secret of American society.

And the dirty little secret is that the internet has none.