To be honest, I don't understand what this perception of Halsin as a sexual predator is all about. For me, he is liberated and likes the sexual sphere, but I don't see him as crazy or obsessed at all. His reticence towards Tav is striking, especially when you learn about his past and the fact that he had a lot of partners.
His and other character's romance flags were bugged for a while, which led to him acting like the player had always romanced him, and a lot of players did not enjoy this. This was fixed already, it's actually very easy to shut him down if you don't want to romance him, and once you do he doesn't insist. I was quite hesitant going into act2 and 3 because I had also heard from all sides that he was a sex pest. Imagine my surprise when not only was this not the case, but that it took me deliberately talking about partnering for it to even come up, he seemed very reasonable and open with his offer, and didn't push if rejected.
I think the actual dislike comes from people not wanting any polyam stuff in their game, it's not something everyone enjoys, granted, but the reaction to it has been a bit over-the-top, imo. There's been a similar reaction to Shadowheart's flirty comments about other npcs that she still makes while you are romancing her.
