In TNG we see Barkley get addicted to the holodeck and use it to play out fantasies with female members of the crew. Through the episode we end up learning that

In TNG we see Barkley get addicted to the holodeck and use it to play out fantasies with female members of the crew. Through the episode we end up learning that Barkley escaped to the holodeck because he was having problems and not being fulfilled in his real life. There was a similar episode of DS9 where Nog gets addicted to the holodeck due to war trauma. The central take of the show is that real life is better for these people in this future communist space utopia and the only reason why you'd go to the holodeck is light entertainment, physical training, or if there's something wrong with your life that needs fixed.