Many psychiatrists believe that people who spend too much time on the Internet can become “cyberjunkies,” users who are addicted to online shopping, gambling, computer games, or sex. These pastimes can entice Internet users into spending more and more time online, away from their responsibilities.

Many experts claim that the most common Internet addiction is to pornography. According to Brian McCormick, writer for the American Medical News, there are more than 2 million Internet sex addicts. Internet sex addicts compulsively visit pornographic websites and spend copious amounts of time in chat rooms engaging in sexually explicit conversations. David N. Greenfield, a psychologist specializing in Internet addiction, argues that Internet addiction can result in “increased social isolation and withdrawal, a possible increase in depression, family separation, marital problems, and reduced job performance.” Some commentators maintain that addiction to Internet...