Best little convent in Texas

A man is driving down a deserted stretch of highway when he notices a
sign out of the corner of his ey! e. It reads:

SISTERS OF ST. FRANCIS HOUSE OF PROSTITUTION 10 MILES

He thinks it was a figment of his imagination and he drives on
without second thought. Soon he sees another sign, which says:

SISTERS OF ST. FRANCIS

HOUSE OF PROSTITUTION 5 MILES

Suddenly, he begins to realize that these signs are for real! Then
he drives past a third sign saying:

SISTERS OF ST. FRANCIS ! HOUSE OF PROSTITUTION NEXT RIGHT

His curiosity gets the best of him and he pulls into the drive. On
the far side of the parking lot is a stone building with a small sign
next to the door reading:

SISTERS OF ST. FRANCIS

He climbs the steps and rings the bell. The door is answered by a nun
in a long black habit who asks, "What may we do for you, my son?"

He answers, "I saw your signs along the highway, and was interested
in possibly doing business."

"Very well, my son. Please follow me."

The man is led through many winding passages and is soon quite
disoriented. The nun stops at a closed door and tells the man,
"Please knock on this door."

He does as he is told and another nun in a long habit, holding a tin
cup answers the door. This nun instructs, "Please place $100 in the
cup, then go through the large wooden door at the end of this
hallway." He gets $100 out of his wallet and places it in the second
nun's cup.

He trots eagerly down the hall and slips through the door, pulling it
shut behind him. As the door locks behind him, he finds himself back
in the parking lot, facing another small sign:

GO IN PEACE. YOU HAVE JUST BEEN SCREWED BY THE SISTERS OF ST.
FRANCIS. SERVES YOU RIGHT, YOU SINNER!