The pirates in Sastasha keep at least some of them for themselves. If you poke around the dungeon a bit, you'll notice that the random NPCs in there are all women, are kept in a cell when not needed, and some have... let's say interesting speech bubbles:
https://i.imgur.com/3NP8qxc.png. The enemies in there also have a line of aggro dialogue to take the women alive. As a side note, they seem to have very specific tastes because all the women are either Mi'qote or Lalafells.
There's also a FATE chain in, I want to say South Shroud, about a Coeurl King who basically has a harem of slaves he keeps in check with blackmail. I think the postmoogle quests had one dedicated to that as well.