I'll concur, I wouldn't mind a bit of relationship content, give a character a reason to try to stay loyal to one guy even when you've become degenerately horny, bit of drama and such. I will say, the "What is my motive?" thing is definitely something I sometimes struggle with in this game, because I don't find effectively contextless sex scenes that hot, and "a random guy hit on you/called you, do them" quickly starts to feel a bit contextless once it gets going.
Granted, that sort of thing is probably pretty complicated to code, but it'd be neat if it could make it in there some day.