There are three types of limericks: those appropriate for women to hear, those suitable for the clergy, and those that could only be repeated when both were out of earshot.
There once was a fellow called "James",
Who liked to make puns and play games.
He liked limericks best,
And was never a pest,
But knew lots of folks with weird names.
The limerick's furtive and mean,
To be ketpt under close quarantine,
Or she'll sneak to the slums
Where she promptly becomes
Disorderly, drunk and obscene!