A Catholic priest, a Protestant minister, and a Jewish rabbi visit a brothel.

The brothel has a sign posted:

WE CHARGE $10 AN INCH!

When they left, the started to compare costs:

The Priest said, "I paid fifty bucks."

The Minister said, "I paid seventy bucks."

The Rabbi said, "I paid fifteen bucks."

The Priest and the Minster start to laugh hysterically, then the Rabbi said,

"I'm not stupid. I paid on the way out."