A Buddhist monk and a nun stayed overnight in a deserted temple because of a downpour.
As they lay near each other for warmth, the monk touched the nun's vagina and asked, "What is that?"
"It's a coffin," replied the nun.
Then she touched the monk's penis and asked him, "What is that?"
"It's a dead monk," he replied.
"If he's dead, then I offer my coffin," said the nun.
So the grateful monk put his penis into the nun's vagina. It quickly sprang up and jumped in.
"How could it be so lively, if it is dead?" she asked.
"It must be fighting for its life," replied the monk.