Sims are autonomously performing romantic interactions more often

also getting this issue

After some more digging, I believe something could be bugged with Lifestyles? I tried checking for hidden buffs on my Sims with MCCC and found that they have an underlying Romance lifestyle, despite me having Lifestyles turned off in the Game Settings. I know of another Sabotage! bug which could be related to the Technophobe lifestyle too. Hope this helps narrow the search.

no this is not caused by lifestyles. if you visted a community lot, you'll see everyone flirting, regardless if they are married or not

I've noticed this as well. It gets frustrating when I have 2 sims casually talking and all of a sudden, they start flirting with each other. For instance, one of my werewolves tried flirting with a sim she was talking to (who wasn't her fated mate) and now she has this tense moodlet. Another instance where a father-in-law and daughter-in-law started flirting even though they were only have a casual conversation. I haven't really had this problem until recently. Honestly, I'd prefer the autonomous mean interaction over romantic as it's easier to fix a negative friendship instead of getting rid of a romantic bar (without cheats).

I have stepparents flirting with adult stepchildren often. It's disgusting!

I've been getting this issue a lot. It sucks because my sims that date have problems because they randomly flirt with other sims. Sooooo annoying.