Yyou can put multiple of the prop item called a Wall surrounding multiple of the prop item called a Toilet in your court so that when your character and servants need to piss you can use the Toilets without seeing you and/or your servants piss. just use the toilet before the bar is completely full to empty the bar before the invasion starts, as well as after the invasion if you fill up the bar drinking potions. you don't need a fetish toggle, you need to have better management of you characters and court. that was the entire reason the Wall item exists, so that the servants and player character doesn't get embarrassed status effect doing and seeing certain things, as well as allowing you to block sight of certain activities you'd rather not see. This is entirely on you both for not buying Walls and Toilets from the Item Store unlocked by the Trading Post.
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your missing the point
(personally) the piss function feels like its being forced onto us, i know and acknowledge that the majority of the community wanted it but for those that did not want it, we are being made to play with something that is unwanted and not needed for a game that was perfect for any one to hop on and enjoy weather it was for the combat, base building, or the (obvious) fantasy sex elements with the futa and different races.
I know you can avoid any scenes you don't want but the difference from previous versions and this one is that they were optional, example being futa and male scenes can be avoided by not having a male character or prisoner interact or be present in your dungeon, were as in the new version as you described you have to spend time and resources to avoid the piss function that is now mandatory in gameplay.
For many people piss is not sexy and is a major turn off that will turn away any new and old players form getting the game or to continue playing if it is mandatory instead of optional and by adding a toggle the creator of the game wont lose any potential new/old players and can still cater to the players who do like it.
Since the rags are 2500gp most of my minions don't even have clothes. I'd rather buy cloths and food then walls. It's a good thing they automatically come with weapons, and can't be unequipped. I'd rather pissing just not be there. But it's also not going to prevent me from trying out the new update