>Anime and manga have random pee/desperation fanservice scenes in even slightly ecchi series

>Look around for lewd ttrpg games
>The community has a huge variance of fetishes but something like 29 out of 30 people just list 'toilet stuff'/'watersports' as a hard limit no matter what other fucked up shit they're into

Where exactly is the big cultural divide on this? Is it Japan vs West? Is it anime-style fans vs non anime hobby groups?
A lot of lewd ttrpg ads still use anime art, so I doubt it's the latter.
And wherever the divide is, why the divide?