Sisters of Mercy and sex for money

A guy is driving along one night when he see's a sign which states "Sisters of Mercy". Underneath the sign is a smaller one stating, "To pay our bills and keep our home, we are forced to use sex for money. It's a small donation. Please visit us!"

Completely intrigued, he pulls into the parking lot where another guy is just leaving with a flushed face. He walks up to the door where he is greeted by a pretty young sister. He asks, "Is it true? Sex for money?"

She say's, "We are forced to use sex for money in order to keep our home. It's distasteful, but a necessary evil for us. Please, follow me."

He follows her among many winding corridors. Finally, she opens a door that leads to a small room with half a dozen attractive young sisters sitting.

"Please.", she says, "Choose the sister with whom you would like to make a donation."

He picks one. She get's up and says throatily, "A donation of fifty dollars please."

He finds this a bargain and forks it over to her. The money disappears into her pocket. She takes him gently by the arm, and leads him to the door in the back of the room. Smiling sweetly, she nods her head and motions him through the door.

The door clicks shut behind him. He finds himself in the parking lot again, facing a small sign. It says, "Thank you for your kind donation. You have just been screwed by the Sisters of Mercy."