You can stumble across this SH/Halsin brothel thing unsuspecting(like I did as example), in rpg you usually explore the world. Swimming banter is unavoidable.
I have more problem with how Halsin is handled. As I said before, you can decline his "offer" in camp, after this you get swimming banter anyway(which he initates and hits on both SH an Tav, proposing a... threesome, after being rejected by Tav. In all of my playthroughs his "confession" occurs earlier than SH's act 3 scene). After that he can infinitely propose himself in brothel despite being put down(you can infinitely reject him there and he will continue to try anyway). You might be interested in drows, but not in that druid, or is this option out of consideration?(Again, I am talking about Halsin and his attempts to join sexual activities with Tav despite being put down over and over again, not SH attraction or w/e).