WIRED -- Apr 22 -- It has almost become mainstream to start relationships on the internet. Dr. Marilyn Volker, a Miami-based sexologist who has been in practice more than 30 years, estimates that 90% of the newlyweds she talked to on her Hawaiian vacation last year -- and there were a lot -- said they met online. There's the Match.com girl you dated three times and have no interest in seeing again. There's the guy who keeps e-mailing you long after he should have given up. What's the etiquette for ending these nontraditional arrangements? Do three dates with someone you met online obligate you to a breakup phone call? Or is e-mail enough? Lynn Harris, co-founder of Breakup Girl, believes that "the only time it's OK to break up by text message is if the entire relationship consisted of text messaging. That goes for e-mail, too."