Hi @SimGuruNick ! I have two rotational saves you can use here: http://www.mediafire.com/download/fdk8rsnjh1prm5t/tworotationalsaves.zip
Slot_0000000a.save (Experimentown D) is a save with 4 played households.
Slot_00000005.save (Simland 1.3) is a save with almost all households marked played.
I get the autonomous relationships - sweetheart, friend, and dislike - forming within about 24 Sim hours, so it doesn't take too long playing on speed 3 to see it happen, especially if the active household doesn't only stay home.
Just to add some of the reason it's an issue for me as a rotational player: I find it disconcerting when a Sim who in my mind is a one-Sim romancer only ends up with a sweetheart romance; if they were player types, it wouldn't bother me. I find it disconcerting to come back to a mean or loner Sim and find they've got a host of new friendships, or to find a nice Sim has a dislike-level relationship with another Sim - a low level I could understand, but in my mind, that could be a Sim who doesn't hate anybody, no matter what. I find it very creepy to come back to a Child and find they've been making full-on friendships with Adults or Elders who aren't even their neighbours. I know my played Sims personalities and stories, and it's frustrating when the game counters them. For nonplayed Sims, go for it! They're not mine the same way.