And then you need to reduce the Scoring (which is the chance encounter of provoking a jealous reaction) I think the game default is like, 25. The woohooer is what will shut off the jealousy, you need to go in and mark it as False. I just use it to shut off jealousy completely, and also take away the autonomous feature to “accuse of cheating” which can and will still happen with the base game, even with the no jealousy achievement.
If you read the FAQ and I highly recommend you do, you’ll know what I mean. Fair warning, a lot of people use the woohooer to make it possible for lots of things (like allowing for teen pregnancy), not just polyamory.