Fenixp: there are some which shine and serve to present some characters in a different light, to deepen their personalities and make them more human
To me, it's the "realism" of NPCs that makes a game fun for me. One of the reasons I don't like FPS is because I find them so bland and hollow. When all I'm doing is killing waves of opponents, none of them stand out, none of them are important. I really get the sense that all I'm doing is killing pixels, and it makes me feel like I'm wasting my time sitting at a box with colored lights.
OTOH, if I'm not just killing a bunch of guards, but the 3rd blue brigade that survived the orc horde 4 years ago, then those opponents have realism, and interacting with them carries emotional weight. To use another analogy, I don't want to play a horror game with a "fear" meter telling me how scared I'm supposed to be. I want to actually feel that emotion. It's connecting with the game world and the creatures in it, the realism of their behaviors and actions, that makes a game fun for me. In this sense, whether I'm killing or fucking or talking or helping or travelling with someone, they are all made more enjoyable when who I'm interacting with has depth and history behind them. This to me is how sex scenes can be enjoyable. (I had the hugest crush on "Nines" Rodriguez from VTM Bloodlines. His personality, history and actions made me swoon, and I would have
loved a sex scene with him.)
And like Jello, there's always room for surprise buttsex too, let's keep it real. : )