Once you get this perk, the filth “gauge” goes up to 200 (normal limit is 100), and while I do have some art for two additional stages of filthiness, I didn’t think they looked good, so they’re not in the game right now. I also had an option for playing with the filth on your body in certain encounters as a sex move that was meant to be unlocked by this perk, but I replaced this with using the own brand on female partners instead, and that ability isn’t related to this perk.
I kinda forgot this perk was still available…I’ll do something with it when I come up with a good idea.