Playing on the Old Joana

Playing on the Old Joana is an unmarked quest in Fallout: New Vegas.

Quick walkthrough
Make your way through the playing halls of the Gomorrah and enter the Courtyard. Here you will meet some prostitutes, one of them being Joana.

Sweet-talk her, reply with wit and she will agree to party with you for free! Once in her room, you can talk to her some more and start the quest Bye Bye Love.