I did a search for this one but didn't see it. I don't recall this entire joke or the exact text, but the jist of it is as follows. If someone knows the full text, post it up.

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Three nuns were confronted by a priest. It seems that they had been caught fooling around with one of the younger priests in the church, Father O'rielly.
The Father who confronted the Nuns asked the first Nun, "Sister, please tell me what you have done."
Nun1 replies, "Please forgive me father, I gave pleasure Father O'rielly stroking him."
The Priest is appauled but regains his composure and says, "May the Lord forgive you. Please wash your hands in this Holy water and sy 10 Hail Marry's."
The Priest turns to the second Nun and says, "Sister, please tell me what you have done."
At that moment the 3rd Nun steps up interrupting the 2nd Nun and says, "Wait just a minute, if you think I'm going to gargle that Holy water after she sticks her ass in it you're crazy!"
hehe.