I'm surprised there aren't more votes for Shar-Teel, she was my favorite romancable NPC
Perhaps people are killing the romance accidentally with the 'go it again' response after the one night stand? I know I made that mistake intitially and it took a while for me to realize what I did wrong. On the other hand, maybe people just aren't into playing an evil protagonist.
If you haven't given in to the darkside yet, I'd highly recommend giving it a try with the BG1 NPC project. The evil NPCs in this mod have enough colorful dialogue to keep you entertained for weeks on end
Good work again guys