For now just sex scenes, the dominance stat change the introduction when you approach to the prisoner if is > 30 the prisoner will be dominant and the scene changes a bit and if it's < -30 the prisoner will be submissive. Now if you have two variations of the same prisoner like the green lizard and the blue lizard you get a bonus scene if both prisoners have the dominance stat > 30 and another if it's < -30.
Now during the full moon event it's possible to imprison both WereBernard and WereLogan if the dominance stat is < -30 they will be submissive and when you're having fun with one the other will join. If the dominance stat is > 30 they will be dominant and when you're having fun with one the other will join. But if you're having fun with Logan you get an extra scene if you have 2 lizardman, 1 werewolf and 1 ratkin in the cells as well.