Created in 1988 by Larry Balsamo and Sandra Schaeffer, it was originally sold only in novelty and adult stores such as Spencer Gifts.
The primary reason for its popularity is its use of sexual double entendres as clues to otherwise innocuous riddles.
All of the clues are puns that may sound dirty on a first hearing, but actually refer to clean solutions.
For example, the correct answer for the clue "The more you play with me the harder I get" is "Rubik's Cube".
Dirty Minds is also played regularly on radio stations across the country.