Actually this is false. In the Marsh you can meet demons among the monstergirls, but they are not uncivilized. If a race is uncivilized or not, it depends on its description on scripts\characters\races.gd
damm in one of my edits i changed "usualy" with "alvays", true demon monster girls exists
Edit: i think i just tryed to find a pattern there, would be nice to dont mine data everytime when you are trying to find new informations about game