Sex sells of course, and sadly shocks some people more than violence, and "to shock" was a thing of the trailer. Other than that, what is the lore purpose of the sex scenes in the trailer?

Is it "an orgy", taking place on occasion of the burning ritual, a spontaneous (?) part of the fair, like artistic shows, eating, drinking and vomiting, as I heard in some comments? If so, Larian showed us a badly composed scene without much sense. The sex takes place in two small areas on both far sides of the three big wicker structures (why there?), there are few people involved compared to the size of the crowd, and all sex involving two persons seemingly is inter-racial. That's not at all a probable scenario of spontaneous acts of having pleasure during a feast.

Or is it an organized part of the burning ritual? Why does the beautiful Human woman who is busy with the Lizardman wear some flower necklaces? It's hiding her breasts (you don't see any primary or secundary sexual area of persons in the trailer, cleverly made by Larian) but is she especially adorned? For what reason? If it's a burning of a sourcerer, what do the sexual acts, mostly or all of mixed races, mean? Has it a magical purpose? Is it pure coincidence or a sign to the gods they maybe want to come back? Who are the people involved and what are they thinking?