Action Girl Action Boy

Action Boy or Action Girl (depending on the character's gender) is a Fallout, Fallout 2, Fallout 3, and Fallout Tactics perk.

It allows for more actions points, as the name suggests, in V.A.T.S. This is sometimes the equivalent of a very high agility rating, and is useful for characters who rely on V.A.T.S rather than real time combat, or people who are not good shots.

Fallout, Fallout 2 and Fallout Tactics
Each level of Action Boy/Girl gives you additional Action Points to spend every combat turn. You can use these generic Action Points on any task.

In Fallout and Fallout 2, the counter only shows up to 10 Action Points but internally it keeps track of any extras. In Fallout Tactics all APs show properly.

Fallout 3
With the Action Boy / Action Girl perk, you gain an additional 25 Action Points to use in V.A.T.S.. This is equivalent of having 12.5 points of Agility, more than what is possible.

Strategies
Action boy is best taken with similar VATS related perks, such as Wired Reflexes, Commando, Sniper, Gunslinger and Grim Reaper's Sprint. Also consider using Jet or Ultrajet, Ledoux's Hockey Mask and Ranger Battle Armor, Energy Weapons(since they use a small amount of Action Points) and high Agility and Luck.

Bugs

 * In Fallout 3, the loading screen "tip" incorrectly lists Action Boy's effect as +20AP.

J.E. Sawyer's Fallout RPG
In J.E. Sawyer's Fallout Role-Playing Game it allows you to perform two skill-related actions during the action phase, but the results of the skill checks are always halved for both.