The Holodeck problem is a hypothetical problem associated with the invention of a pleasure device so addicting that it has the potential to dangerously addictive.
Mario: Number 5 - Holodeck!
Fafa: No, no! Out of all futuristic products in the Star Trek universe, we should not create the holodeck. Let me explain. A holodeck is like a rec room on a star ship, you can interact with anything you can imagine.
Mario [off screen]: This is amazing!
Fafa: Mario's been in there for a week
Mario [off screen]: I'm not coming out!
Fafa: People would never, ever leave a holodeck. They'd sit around getting fed ice cream by Kate Upton or Bradley Cooper.
Mario [off screen]: Six! There are six Kate Upton's in my holodeck!