Incest used to be a reward trait in WW at one point. Then Patreon threatened to kick him off the platform, so it became an add on...
That makes no bloody sense. So they're ok with it being something that one can add on right away but had an issue with it being a reward trait? I think hid it from them and they are a US company, in the heart of liberal California, there's no way they're going to allow mods that violate US sex laws.
See what happens, if it isn't re-added in the next update, I don't think its coming back. Don't be surprised if Paetron goes after the peepers thing next, that is considered sexual assault in California now I believe, and Paetron is in California. But well, I blame the modders. Like I said before, New Vegas and Skyrim get all the good stuff because the modders do it for free and use sites that don't give a damn. A lot of Sims modders want to profit from their work which means Paetron, Paypal Donation, or what have you, and they have strict rules. My opinion art comes before profit.. but well, if they want to be whores to Paetron, that's on them. I'm half tempted to go back to Skyrim... but it got confusing. Whatever Bethesda did to the 4K version a lot of mods for the original version don't work on it, so many modders had to re-do their mods for the 4k version, leaving those of us who don't give a damn about 4k sol. That was a cheap double dipping move by Beth, I mean they should have been working on the sequel, adding some graphic improvements to a 10 year old game.