If you're trying to get too close and personal, then you're barking up the wrong tree. Actually, I don't like DnD styled format so prevalent in H-games and my perfect porn game would have nothing to with infantile imaginary monsters and getting one's heroine involved in acts of debauchery under the pretence of fulfilling some otherwise noble 'quest'. I'd love nothing more than a free-style sex simulator with well-established perverse 'laws of physics', with no silly plots and exhausted tropes. My Karryn does not use a halberd and I don't care really that she pretends she's a correctional officer, a receptionist, a waitress and a cocksucking toilet whore in one. I play this game to experience progressive sexual perversities, not to solve the silly mystery of who the fuck the Captain is or if she will marry the blond Emperor or not. I skip these cutscene dialogs containing more bullshit than your typical Argentine telenovela would have back in the 80ties. Fortunately, the devs know well the story is BS and also assume the players know this as well.
Having said that... imagine a situation where there is a bunch of watersport fans asking again and again and again for Karryn to be actually able to take (or accept!) a leak in that bathroom she repaired. They're fapping like crazy (to better understand the fetish) and it's not happening, why? She's on a toilet seat, goddamit and there is no option for 'Number 1', not to mention 'Number 2'. Whyyyyyyyyyy?! With high enough slut level, she's certainly getting off on the smell of the toilet, she calls herself a human toilet, yet she does not do what a toilet is supposed to do.......
I personally wouldn't mind if some forms of watersports were added (and fisting and heavier forms of BDSM-play including extreme restraints, objectification and this and that), but I would never ever nag no one in particular about that, while philosophizing about 'realism' or 'understanding a fetish through a boner'. Now, can you zip up and try to understand a turn-off?