DMOZ Adult Games
A Role Playing Game, or RPG, is a formalized way of playing "Let's Pretend"; "improvisational acting without an audience," or cooperational storytelling.
This category covers what are usually called Tabletop Roleplaying Games, because they are often played sitting around a table, with books and dice. Each Player controls a Character in an imaginary world, while the Game Master controls everything else in the world. There are rules, often involving dice rolls, charts, and paper and pencil record keeping, deciding the effects of Characters' actions: "I try to hit the Goblin with my sword - do I get him?"
The first, and still most popular, roleplaying game is TSR's Dungeons and Dragons, set in medieval fantasy. Other popular games systems include White Wolf's dark modern Vampire, FASA's cyber-fantasy Shadowrun, Hero Games' superhero Champions, Chaosium's 1920s horror Call of Cthulhu, Steve Jackson's generic system GURPS, and Palladium's mixed setting Rifts. Live Action involves dressing up and acting out your character's actions, in any setting or rules system.
There are hundreds of variations on all the above, and each group usually comes up with "house rules" of their own. Many even evolve into independent Free RPGs