Let no corrupt word proceed out of your mouth, but what is good for necessary edification, that it may impart grace to the hearers.... neither filthiness, nor foolish talking, nor coarse jesting, which are not fitting, but rather giving of thanks.—Ephesians 4:29; 5:4
One of the most shocking things in the church is the dirty-mouthed Christian who always walks on the borderline. There is no place for borderline stories that embarrass some people, and there is nothing about sex or the human body that is funny if your mind is clean.
There was once a gathering of officers, and George Washington was present in the room. One of the young officers began to think about a dirty story that he wanted to tell, and he got a smirk on his face. He looked around and said, "I'm thinking of a story. I guess there are no ladies present." Washington straightened up and said, "No, young man, but there are gentlemen." The young officer shut his mouth and kept the dirty story inside his dirty head and heart.
Anything you could not tell with Jesus present, do not tell. Anything you could not laugh at were Jesus present, do not laugh at. Rut, Rot or Revival: The Condition of the Church, 67.
"What an important reminder, Lord! Keep my thoughts pure so that the 'dirty story' might never enter in the first place, and then I'll never be tempted to share it inappropriately. Amen."