A priest and a num were crossing the desert on a donkey. The donkey finally could not stand the heat, and died. The two travelers had very little water and food left at the time.

After a while, the priest began disrobing, and said. "Since we are going to die anyway, there is just one thing I would like to do before I pass on".

The nun was shocked by his behavior until she noticed a large erection on the man. "Father, what is that thing?".

The priest replied, "That is the giver of life".

Whereupon, the nun said, "Then, stick it in the donkey's ass, and let's get out of here".