Andy enjoys watching and listening to people, especially when they are having sex. It was for this reason that he installed listening devices into all of the rooms at the bed and breakfast he helps his mother run. Unbeknown to him there is a nanny cam in his room so his mother can watch him. The story tells about how he started being a voyeur and details some of the listening he does and the watching his mother does.
I used to listen to my parents having sex when I was younger. Parts of this story are drawn from a variety of incidents in my youth and therefore real, however, the story's conclusion isn't true and is very much a fantasy. As to where the truth stops and the fantasy starts... that is a brilliant question and one that probably deserves an answer.