Originally Posted by ldo58
I think the wild card for the roleplayer is the fact that Astarion is undead. So how do undead express their emotions and handle trauma ? I guess there's a wide landscape of possibilies to choose from.

Take the "romancing" example. Astarion certainly likes sex. At the grove party he tells you so much. Can he also "love" ? Probably not in the same way as a mortal. But Dracula had 3 brides that he cared for well. (Untill he abandoned them to rush to his new fascination, Mina) He cerainly didn't seem to treat them badly, as Cazador trated his conquests. So Astarion could get infatuated with a party member. Have sex with them, care for them and try to get into a stable and permanent relationship. Like Dracula, I think he would want to turn the companion to a vampire also. But, if the love were reciprocal then..... why not ?

I think these are very good points, interesting to think about for sure. I can see him becoming infatuated with a party member or even falling in love with them. We can't know for sure how different it is for an undead but it's something to think about.
Yes, he does say he likes sex early on in the game, and it's certainly clear he enjoys it with Tav/Durge (if in a relationship) after he finishes his main quest. He also can potentially ask your character why you didn't invite him if you spend the night with Mizora.