With the availability of the Internet, pornographic materials are readily accessible. Pornographic materials may have a link to addiction and other deviant sexual behaviour. In this case report, we highlighted a link between voyeuristic disorder and internet sex addiction. Mr. SK is a 22-year-old single gentleman who was referred for psychiatric assessment due to voyeuristic acts. He had been watching pornographic materials since 16 years old and became addicted to it. � 2018 Faculty of Medicine and Health Sciences. All rights reserved.