Forgot to ever follow up on this after my joke response.
I think there's a very low chance we'll see any appeal to niche fetishes or ones that depict such bodily-waste functions. Not in this game, at least, I'm not sure if it'd even be something you'd find on itch.io to be honest. It's not only niche, but also has a lot of disfavor laid upon it for the fact that it's considered "gross" by most people due to the fact it's unsanitary and so forth. Sex is already considered degenerate to a degree by more holier-than-thou types, and adding on urination would probably end in the immediate burial for indie games on most platforms like Itch.io, especially with the rounds that card companies are making.
Also, the tree knows your sin.