Cathouse Blues is a graphically altered version of Gigolo in which you are a guy going to various whorehouses to get "serviced".
Cathouse Blues is a game for the Atari 2600. In it, you control a naked man who breaks into houses to have sex with the women inside. A reversed version of the game called Gigolo was also released. It was reviewed in the episode Atari Porn.
The game is otherwise the same as Gigolo.