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 sexbot, Fisto, must have a programming holotape made by Ralph. Then, hack the terminal (science 50), (or lockpick the cabinet (lockpick 50) for the passcard) to program Fisto.