"Five good leads" joke

Tommy Shaughnessy enters the confessional box and says,
"Bless me, Father, for I have sinned. I have been with a loose woman."
The priest asks, "Is that you, little Tommy Shaughnessy?"
"Yes, Father, it is."
"And who was the woman you were with?"
"I can't be tellin' you, Father. I don't want to ruin her reputation."
"Well, Tommy, I'm sure to find out sooner or later, so you may as well
tell me now.
Was it Brenda O'Malley?"
"I cannot say."
"Was it Patricia Kelly?"
"I'll never tell."
"Was it Liz Shannon?"
"I'm sorry, but I'll not tell her name."
"Was it Cathy Morgan?"
"My lips are sealed."
"Was it Fiona McDonald, then?"
"Please, Father, I cannot tell you."
The priest sighs in frustration. "You're a steadfast lad, Tommy
Shaughnessy, and I admire that. But you've sinned, and you must atone. Be off with
you now."
Tommy walks back to his pew. His friend Sean slides over and whispers,
"What'd you get?"
"Five good leads," says Tommy.