A priest decides to pay a visit to a nearby convent. The convent is in a run-down neighborhood, and as the priest walks down the street several prostitutes approach and proposition him.

"Twenty bucks a trick!"

These solicitations embarrass the priest who lowers his head and hurries on until he gets to the convent. Once inside he displays his naiveté by asking the Mother Superior, "What is a trick?"

She answers, "Twenty bucks -- just like on the street."