At the suggestion of a friend, gay Leo (Kevin McKidd) enters therapy after many failed relationships make him fear for his social life. In a group session (led by Simon Callow), Leo comes clean about his feelings for a straight member of the group (James Purefoy), which leads to an affair between the two. The situation becomes further complicated by the appearance of Leo's high school sweetheart (Jennifer Ehle), who still has feelings for him.