Funny Dirty Joke

Four nuns die and arrive at the Gates of Heaven. They line up in front of St Peter.
The first nun says “St Peter, I once saw a man’s penis. May I still enter?”
St Peter replies “Wash your eyes in this font of holy water and proceed.”
The second nun says “St Peter, I once touched a man’s penis. May I still enter?”
St Peter replies “Wash your hands in this font of holy water and proceed.”
St Peter suddenly notices a scuffle between the last two nuns. The fourth nun is trying to cut in front of the third nun. “What is going on?” he asks the fourth nun.
“I’m trying to go first so I can wash my mouth out before she sticks her arse in the font”.