I was romancing Alistair on my playthrough, had Oghren, Wynne, and Alistair in my party, led to some interesting conversations. Most of my favourite ones were between Wynne and Alistair, one where Wynne caught Alistair staring at my characters behind, and one where she decided to give him "the talk". Priceless. Then there's Alistair's "have you ever licked a lamppost in winter?" conversation. Oghren had a few funny ones too, though i picked him up late so i probably missed a bit. While kissing Alistair Oghren says "hehehe, don't mind me I like to watch" O.O I also lol'd during a conversation about legs... it went something like this
oghren: so what did yo do with her legs?
Alistair: what?
O: you know, dwarven legs are a little to stubby to be used as an accessory.
A: I.. didn;t do anything with them..
O: Ah, just pushed em out of the way and went about your buisness eh? hehehe.