The nature of pleasure is misunderstood. People often believe that the purpose of life is to be happy. No it isn’t. Humans, and all other life forms, evolved to reproduce. Those creatures that reproduced successfully in the past are still here today, those that didn’t have died out. Were it an aid to reproduction to be miserable, we would all be miserable. Pleasure has a function, and adaptive purpose, and it serves an end. The end it serves is reproduction. We get pleasure from all the things that helped our ancestors to survive and reproduce.