And they show interest in you as a person, but I wouldn't call that horny. Once I turned them down they didn't bother me anymore, and I've been to act 3 3 times already due to failed romances (if you don't have shart in your party in act 1 it's quite hard to raise her approval with just act 2 shadowlands. I tried everything, but nothing, nada.) and maybe 5 times to act 2 too, so I've had plenty of their interactions.

Think of it this way. If you weren't there they wouldn't have even gotten together as a group, they would have been lost or alone and most would have begun their ceremorphosis process since only shadowheart was with the artifact, and that unsociable girl would hardly join with anyone. So you are the glue holding the group together, paying them attention, the only one who's basically tending to their personal needs, and assuming they all find you attractive, I think that it's natural to develop a crush in you, the leader. Then it's a matter of how each one likes their courting and if you are interested.

You can do event 1 and 2 of Gale and turn him down with a sentence that was like "I'm not interested, Gale", which is nowhere near the "Eww you suck" option I've seen everywhere. I think that option shows up with his apparition in the camp? but bby that point if you are a good friend of his, you really should go to see what's up since that scene triggers close to the event with Elminster. Then if he's interested in you you can say no, or if you are already in another relationship, there won't be any sexual trigger or anything, and if you are pursuing him, I recall that the third option was what stated before.

IDK, the bonds you form with your party members feel quite real to me after considerin what they are going through and how are they acting with each other in the situation they are in where nobody is really helping them.