Btw...if you wanna do it; Steam has in germany a extra rule where 18+ games need a USK to be sold there. Or you can make it that you remove the adult stuff and let it be patched in from a diffrent website. Your choise.
Yeah, I know, thankfully, I have ways of publishing it on steam outside of Germany.
Releasing a game and having an NSFW patch elsewhere might get you delisted too, I heard. It is not certain, but I wouldn't want to risk that...