Wang Dang Atomic Tango

 is a quest in Fallout: New Vegas.

Quick walkthrough

 * Beatrix is found in the Old Mormon Fort. You either need to convince her with a speech check, barter check, or you can give her a bottle of Absinthe.
 * The "smooth talker" can be either Santiago or Old Ben. To recruit Santiago, just ask. For Old Ben, you'll need good charisma, and high Speech skill.
 * The sex-bot, Fisto, found at Cerulean Robotics, must have a programming holotape made by Ralph. Then, hack the terminal (science 50), (or lockpick the cabinet (lockpick 50) for the pass card) to program Fisto. There's also the key to the cabinet in the cafeteria (on the floor, in front of the television set by the decayed corpse) [Please confirm this is the key for the cabinet]

Behind the scenes
The name of this quest is a reference to the songs "Wang Dang Sweet Poontang" and "Wango Tango" by Ted Nugent.