I'd like to see a sort of "Reputation" score, tho I know it would be complicated or time consuming to do.
Could be split between different reputations: combat rep (though guy/gal or wimp), sexual rep (sensual lover or cheap slut). Maybe some others too (good at bargain, renowned diplomat, etc), but would be maybe too complicated.
So, an NPC (or specific encounters) options (both talk and sex) could vary based on the rep score:
a fighter-type of NPC might be a intimidated/ admired/ respectful by your "though guy/gal" rep, but eager to try to beat you because your sex rep.
A sex scene could have variations depending if you're a sensual lover (sort of Kamasutra expert) or a cheap slut (you just like to get fucked senseless). Note: with variations I mean some extra details on the already existant text, not a whole new text.
A talking scene with some arrogant type of NPC might have alternative options for dialog if you have a though reputation.
This could lead to certain combinations to fit desired character roles:
a "wimp-cheap slut" rep is the sort of submissive char that doesn't get much respect around (doesn't affect the in-game achievements anyways).
a "Though-sensual lover" might be the alpha type of character that everyones nods respectfully and is eager to fuck.
Come to think of, there might not even a need for a respect score: a simple call for win/loss battles and specific sex scenes would be enough, without needing to add a new set of flags.