I used to love the old style MSN chatrooms, figured it was the only place where I could have a laugh and gently tease folk (and not get my face rearrangedfor doing it) without having to get dressed and leave the house- yes you do have to get dressed to go out your front door, folks give you odd looks otherwise.
They were highly addictive and I can see why it may become a problem in a marriage. A secret life though? I'm too forgetful (and lazy) to do that, I'd trip myself up before it got too far! But again, I can see the attraction.....if ya life's crap, what's wrong with 'spicing' it up with a few porkies?