Which actor did not act in a movie with the word 'dirty' in its title?
Correct answer: Kevin Bacon

tunegrabber
okay took a minute, but I thought of a movie for each of the other three, but not kevin bacon, who probably has more movies than one might be aware of.

player one.five
I bet he's less than 6 degrees from someone in a "dirty" movie...

toothless beachrat
Bacon is nice guy, met him at the gym I worked at in the early 90's, called Sports Club LA. It was where many celebrities and pro athletes were members, and was 1000,000 square feet.