Wedding planner Karen Petersham loves weddings–usually. Her newest client, Sophy, has brought along her best man for advice. And the best man is none other than Karen's sexy ex-husband, Dexter Crane. But there are rules when engaging in ex-sex:1) Do not get romantically involved (obviously)2) All fun. No fight.3) Two words–booty call!4) (Reminder: nix the romantic involvement)5) Remember why it ended (important!)6) And get out before you fall in love with him again….