Meet Katherine. She loves the internet. She has been using it for over 13 years and is on it for more than four hours every day. She uses it mainly for research and email and, of course, instant messaging, where she keeps in touch with her partner of 10 years, John. They use the internet as a means of staying connected and, on occasion, for engaging in cyber-sex, which she describes as 'fun'. When they first met face to face, Katherine said they couldn't keep their hands off each other. Sound familiar? You bet! Recent research has shown that almost 30 million people in America know someone who has been in a long-term relationship or has married someone they met online, and over 63 million know someone who has used an online dating site. [Introduction]