While she's home alone, Mark sleeps with Tracy and while he's lounging about in her bed, Becky turns up. Then, unexpectedly, Robert returns home early.
A concussed Mark tries to save Robert and Tracy's marriage and debates a personification of his own penis about whether to have sex with a sleepwalking Becky.
Robert and Tracy struggle to keep Mark and Becky and Becky's new boyfriend from meeting after a scheduling mistake leads to all of them being invited to dinner the same night.
Robert and Tracy look after Mark after Becky leaves him but they seem to be more distraught than he is. Meanwhile, Mark reminisces about his and Becky's farcical first date.
Mark juggles three women in his apartment: a drunken stranger he brought home from a club, Tracy who wants to move in after Robert kicks her out, and Becky, who has broken up with Trevor.
Through a series of misfortunes, Mark winds up trapped naked in his new neighbor's flat. Meanwhile, his aunt who doesn't know about his divorce visits and Robert becomes a transsexual.
Charts the key moments of Mark and Becky's relationship from their meeting at a funeral, to a disastrous dinner with boring friends and right up to their break-up at a surprise birthday party.