<p>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:</p> <p>1) Do not get romantically involved (obviously)</p> <p>2) All fun. No fight.</p> <p>3) Two words–booty call!</p> <p>4) (Reminder: nix the romantic involvement)</p> <p>5) Remember why it ended (important!)</p> <p>6) And get out before you fall in love with him again....</p>