Matthew goes into a confessional box and says "Bless me father for I have sinned, I have been with a loose woman."
The Priest says "is that you Matthew?"
"Yes father, it is I."
"Who was the woman you were with?"
"I cannot tell you for I do not wish to sully her reputation."
The priest asks "Was it Brenda O'Malley?"
"Was it Fiona MacDonald?"
"Was it Ann Brown?"
"No father, I cannot tell you."
The priest says "I admire your perseverance but you must atone for your sins. Your penance will be five Our Fathers and four Hail Marys."
Matthew goes back to his pew and his buddy Sean slides over and asks "What did you get?" Matthew replies "I got five Our Fathers, four Hail Marys and three good leads."