I also want to tag this with #sex #thehumancondition but oh well.
Gay Talese describes his letters and meeting with Gerald Foos, an Aurora motel owner who watched his guests have sex without their knowledge for decades, Foos documented the erotic episodes in his mind to provide valuable truthful records of sex and relationships, for science.
He was never caught and has only now decided to go public with his manuscript, which Talese likens to the writings of fictional and real psychopaths.