I'd be leary of reading too much into the approval system at this stage, I've yet to have a playthrough where Astarion isn't willing to sleep with you based solely on dialogue choices. I'm also not sure how much of the flags and triggers aren't still placeholders for the purpose of testing in the EA area, can't be sure.
I've you haven't maybe check out some earlier threads that dealt with these topics (there are a bunch more I can't remember I'm sure) :
Dragon Age Origins - Next Age RPG c. page 3Dragon Age Origins - Next Age RPG c. page 8Character Acting, Demeanor, and PersonalityWill there be a prologuemurderous horny companionscompanions are amusement parksadult content in BG3 locked
Herosexual NPCs locked
Does anyone like the Origin System? not really an old tread