I dunno, some Bioware games the love scene was terribad (I'm looking at you, Origins!), but some are pretty tasteful. The Mass Effect 1 ones were really artsy, and Dragon Age 2 did a WAAAAY better job with it then most of their games, I think. The Merill one (post-coitus) was pretty cute, with Hawke rubbing her arm.
http://www.youtube.com/watch?v=Zah6pyS0JDQ
There is no real way to have a real time romance build in a game where you choose your dialog though. You'll run out of options eventually, until they make a game where you can actually type your text in, but even then, people could exploit it to get max relationships really quickly. So I think the way Bioware handles it is best.