How do i get the piss perks and its upgrades?
The easiest way is to just do urination oriented content. With the correct exhibitionism-related perks you can start peeing in public. You can craft and use piss liquors on NPCs. After reaching the bandit camp there is a special activity you can do there. There is also an activity in the dungeon. Basically everything related to pissing except just peeing at home or having an emergency counts toward unlocking the perks.