There is no story reason for it. Halsin was never intended to be a companion, hence "the wall" in act 1 and 2.
But some people thirsted constantly for Halsin sex during EA that Larian decided that they could score easy points, especially as sex became the main selling point of the game when everything else failed.
So the story was rewritten and Halsin became a companion in act 3 (he was supposed to stay in act 2) and as only character trait they gave him "polygamy bear". But Larian did not rewrite the old and already finished content where Halsin is not sex crazed.
Pretty much. Personally (especially as a small halfing who had no interest in Halson) I found his sudden shift from being pollite professional, to sex addict rather unsettling.
This
But to be fair, as stated in the other Halsin threads, many people wanted to legit romance him, not just bang him. But as ususal, sex comes out on top, as you said, and it heavily reflects in his romance. I never got access to EA Halsin. But I was legitimately hooked on him after talking with him a little when you rescue him and at the party.
I think a lot of his cut content would have been amazing too. Supporting him and being there for him as he confronts the curse, Ketheric, Isobel...
