???
The only who-slept-with-whom plotline I can think of is the one where Josh Malina's character is dating the porn starlet, and that had a lot more to do with exploring his personality and relationships than it had to do with "inappropriate sexual liaisons". Also, it lasted, I think, two episodes.
And it's not that I need "interpersonal relationships" in the way that I think you mean it, but, rather, that the characters portrayed need to seem like people, not robots. I think the dialogue was excellent, but it takes an extraordinary actor to make it work, especially in a dramatic setting, and The West Wing "only" had a couple of extraordinary actors, which meant that only about 20% of the cast were up to the dialogue. IMO. But even those actors couldn't make me feel like I wasn't watching a dozen different people all recording their segments without ever having met each other.
One of the problems with Sorkin's dialogue is that it's hard for others to imitate -- many of the early episodes of Sports Night tried to mimic it by having people talk fast, but just repeat whatever the other person said, which made me stop watching it in its initial run -- so he either has to script every episode, which isn't going to happen, or he the show has to be inconsistent.
All that said, I still have high hopes for 30 Rock. Uh, I mean Studio 60.
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Bitt Faulk