Season 4: Feel free to insert your own "four-play" joke, or for that matter, your own "insert" joke. Sex is still topic 1 for the intertwined group of "exes and best friends," but in this pivotal season there are momentous "relationship issues" that will upend all their lives (insert your own "upend" joke while you're at it). Susan is pregnant, inspiring in Steve nightmares about his own execution and unflattering comparisons of the birth process to John Hurt's iconic gut-busting scene in Alien. Missing in action is the Kramer-esque Jeff (although he makes something of a return in the season finale). Joining the ensemble is Oliver, who is more in the Chandler mode as a lovable loser with the ladies. These inevitable comparisons to "Sein-Friends" are no doubt heresy to Coupling's most devoted viewers. Indeed, this series does benefit from creator and sole writer Steven Moffat's comic voice and vision. He provides his ever-game cast some witty, funny-'cause-it's-true dialogue, as in Oliver's observation that "Tea isn't compatible with porn." This Britcom is also less inhibited in language and sexual situations than its American counterparts. In the cleverly-constructed opening episode, in which the same "9-1/2 Minutes" are witnessed from three different perspectives, Sally and Jane can do what was left to the imagination when Monica and Rachel offered to make out in front of Joey and Chandler. The birth of Susan and Steven's baby ends the six-episode season on a satisfying and surprisingly moving grace note. A bonus disc takes viewers behind the scenes with segments devoted to bloopers and interviews with cast and crew. --Donald Liebenson