"Nuns and large families." joke

This was told to me by Father George Alderson, of the RCC.
There was a nun doing charity work in a large metropolitan hospital.
As she was walking by the nursery, she encountered a man looking through
the window at a newborn.
"Is that your child?" said the nun.
"Why, yes, it is sister. She was born this morning," said the man.
"Are you Catholic, young man?"
"Yes, sister."
"How many children do you have?"
"This is our twelfth child. We are hoping for more."
"Your twelfth child! How magnificent. God has truly blessed you. I shall
remember you in my prayers."
"Thank you sister," said the man.
Later that same day, the nun encountered another man at the nursery.
"Is that your child, young man."
"Yes, sister, it is. I am very proud of her."
"Are you Catholic, young man?"
"No sister, I am not."
"How many children do you have?"
"This is our ninth child."
The nun was shocked and gasped, "Sex maniac."