If some of our dialogue options are to believed, the possibility of getting our characters involved in multiple partner situations is still potentially on the cards.
If I get through all of my other goals, talking about three or four person choreography is something I may indeed have to get around to as well... but that would be a very big task to approach, and an even bigger one for Larian to accommodate varying partner sizes for well, so from here it looks like quite a mountain to scale.
I think Larian is follish not to do group sex. Nearly all, if not all companies like to keep it at 1 on 1.
