@Mchelsing I looked it up and it's apparently called a sukebe isu (スケベ椅子). From what I can gather it allows for easier crotch washing while sitting down? That's seemingly the only benefit over a normal stool I've been able to find for it. I think it's just used for the novelty
@Mchelsing Can you actually touch a coochie from below if she's sat down? No right? That's why there's a whole in there, so it makes the fingering easier... Same if you wanna jerk a guy's funny meat off lol