"Nintendo allowed THAT game on Switch?"
Bro, familiar yourself with Doki-Doki Majo Shinpan, the porn game that could not be. Published by SNK no less.

I'm still pretty proud to be able to beat this game. The author of the guide I used gave up on the final boss. That was a battle that could destroy your touch screen.

You used to hear a lot about this as one of those ultra obnoxious "wow it's so fucked! Japan is craaazy!!!" conversations that used to dominate the internet. Anyway, the game is kinda nothing. It's a fanservice thing and it does it's job just fine. It turns out all the "hooo fuck, how is Japan putting this stuff out?!?!" talk was mostly just thinly-veiled racism.