I have bipolar disorder and had my first manic episode recently.  About 5 months before I was diagnosed I started having an affair with my husband's best friend.  I really can't explain why but it was just sex I wanted.  I chose him because he was handy even though I didn't really find him attractive.  I didn't want to hurt my husband but something in my head craved sex with someone new.  I just felt I deserved to fulfill this craving. I certainly didn't want to divorce my husband but he suggested it when he found out.  What a mess.  I am now medicated and feel much better-no cravings. If I start to go manic again I hope I have the guts to call my doctor.  It's hard cause it feels SO good to be manic.