Ring-a-Ding-Ding!

 is a quest in Fallout: New Vegas.

Quick Walkthrough

 * Speak to Swank at the reception desk when first entering Tops Casino to reveal that he is friends with Benny.
 * Pass a series of 3 speech checks (having skill requirements of 15, 30, and 45 respectively), and he will grants you the key to Benny's suite, and delay Benny from going up there while you look around. He also grants you permission to carry guns in the casino
 * Giving your weapons to Swank and then killing Benny causes them to be lost
 * Giving away your weapons then providing evidence that Benny is evil will result in the return of your weapons, and the chairman at the front desk will not attack.
 * Go to Benny's suite on the 13th floor and loot.
 * Speak to Yes Man in the suite to find out Benny's plan and about the Platinum chip.
 * Once you get this information, go downstairs and talk to Benny or Swank.

Detailed walkthrough
Now that you know Benny is at the Tops casino located in New Vegas, it's time to go find him. Let him have it! You can deal with Benny in a few ways:
 * If you speak to Benny and choose the peaceful resolution option, he will give you the key to the Presidential Suite, and promptly send four bodyguards to kill you, fleeing the Tops Casino to The Fort.
 * If you pass the speech check to get Benny accompany you up to the presidential suite he will make you an offer. You can accept or kill him, or do both.
 * If you choose to kill Benny in his suite, you'll have every bodyguard and dancer to deal with.
 * If you choose to kill Benny on the main floor of the casino, you only his four bodyguards will turn hostile.
 * If you cannot complete the 3rd speech check (Skill Req 40) but can complete the second (Skill Req. 25); you'll be allowed to carry weapons into the Casino. Then you may assassinate Benny.
 * If you forgive him and he will leave and send his guards up to kill you.
 * [Black Widow Method] Benny will have a Black Widow dialogue option. Follow this chain of conversation to seduce Benny into taking you upstairs. Have sex with him, and then there will be an option to kill him in his sleep. No one else seems to mind or suspect you if you dispatch him this way.
 * Also using the Black Widow method, instead of having sex with him, you use the "attack" speech option and kill him. No guards seem to hear or come in if you do it this way.
 * Also using the Black Widow method, you can let him live (after you sleep with him) and he will leave a note the next morning, saying you will have a spot next to him when he takes over.
 * If you speak with Swank and not Benny you can convince him that Benny needs to be taken care of. Swank will send Benny to his room where you can talk with him and also choose to kill him.  This won't cause the casino to become hostile to you.  If you kill Benny this way, you can talk again with Swank and you will get the Presidential Suite.  There are other dialog options with Swank besides Benny needing to be taken care of, and other options like working with Benny when you talk with him.

If/When Benny is killed Swank will take over as Boss of the Tops Casino.

Behind the scenes
The title of the quest is a reference to Frank Sinatra's 1961 song Ring-a-Ding-Ding.