Use Value derives from the inherent qualities of the object itself, and is inseparable from it. The usefulness deriving from the inherent qualities of a Use Value are what orthodox economics calls Utility. If I find a diamond useful, and want it because of its specific hardness, I cannot separate its quality of hardness from the diamond itself. To possess the specific hardness, I also have to possess the diamond itself. The same applies to services provided by humans. If I want a live performance by Robbie Williams, I cannot have it without Robbie Williams. If I am happy with a recorded version, I cannot have it without also the physical medium on which it is recorded, and so on.
Use Values do not have to conform to any moral standard or cultural norms. A society might frown upon Opium or heroin use, but for someone who has a desire for Opium or Heroin, it constitutes a Use Value.