The whole brothel situation is probably largely to blame for the sentiment that Halsin is sex crazed. Apart from him inserting himself into the orgy, his dialogue during it is also very cringe. Worse, while he insists that you make sure you settle things with your partner during the poly-proposal, he (same as the PC) simply goes along with how the orgy proceeds when the other participant is miserable, which also casts an unfavourable light on him and makes you question how sincere is usual more wholesome demeanour is.
I'm not sure if I'm quoting Anska the correct way, but this is what taints Halsin for me. I'm sure he isn't meant to be a creep, but suddenly his established concern for consent goes out the window at the brothel. He either doesn't notice or doesn't care when Astarion dissociates. He doesn't care that Gale is clearly uncomfortable or that he flees the room. I'm not sure if Gale is watching through his projection, but if he is, then Halsin is mocking him for not doing a sexual activity he never agreed to. If Gale isn't watching, then mocking the projection is just weird.
I really don't think they wanted Halsin to come across as a predator, but these scenes make it seem like he just pretended to care about consent until characters dropped their guard. I have to just pretend the scenes don't exist, or it ruins the character. I like him when he's doing his druid thing or ending the shadowcurse, and I want to be able to enjoy those parts.
It also doesn't help that you can't turn him down until act 3. The game thought I flirted with him at the party (I didn't, bug?), and he would make flirty comments from time to time. I was not able to tell him no, so it just kept being occasionally uncomfortable. I think we should be able to shut down ANY romance at any time, but it isn't possible in the flirting stage with some of the characters.
