Halsin was clearly "inspired" by Hiravias - a perverted very sexually active companion from the first Pillars of Eternity.

Example of his banter:

Hiravias: "...before I knew it, the stelgaer was on top of me and I was face down in the dirt."
Sagani: "Arrow to the throat. That stops them."
Hiravias: "What? No. I was spiritshifted. And she was in heat. So I aimed for the throat but not with an arrow..."