Why I Did It
I actaully have had three affairs. One was a one night stand so I guess that was more of an indescretion rather than an affair. The next one is someone I am still involved with (over 10 years). I met her in Sydney on business. She now lives in DC and I see her once or twice a year. The third one was a extremelhy torrid affair with someone I knew from high school. Lasted about 9 months and I almost left my wife for her. The only reason I stayed was for my daughter (yet my wife kind of forgave me).
So why did I do it? I think that still is a bit of a puzzle but I think that basically I am swinger at heart and marriage just doesn't suit me unless the other partener shares the same mindset.