Games like the Witcher are closer to interactive movies than Mass Effect would be, in the sense that, Geralt is his own man. He is not you. Cmdr. Sheppie is actually 'you'. Also, Geralt and Trish have been together for a very long time according to the story, sure, Geralt has some trouble keeping his weiner (unrelately to a certain politician) in his pants, but for the short amount of time you get to mess around with Geralt in his little world, there's enough info shoved up our gamer's dunghole to figure out that, they are a pretty lovey dovey couple. Same as those tali-lovers would love to think they are(wait till she removes her mask and reveal her she-goat face

).
Maybe I am just a male desensitized to sex on TeeVee, too much porn or too much spartacus might be the culprit, but I still think the explicit sex scenes in the witcher is at a respectable level. Not to mention the humor that came along with that one, think 3 bandits talking about a certain tale, while Geralt and his weiner are getting a more practical adventure.