Hiya, I answered your question on F95, I’ll just copy paste it here:
This is actually not correct, in order to check the box on Steam you have to have the rating approved by the agency. In order to get USK approval and get a rating you need to pay an upfront fee of 1200 euros. We would have to apply for this again every time we updated the game and added content (that only costs 300 euros per update though). The issue is we wouldn’t make that much back from German sales. Unfortunately, the game just hasn’t sold well enough for that. Also, Steam would remove our game if we were found to be checking those boxes without actually getting the game rated by the agency specified, so it’s not worth the risk to us.
We’ve been looking into this for a long time so our German players get an equal experience where we can offer it.
If we go viral or something and the sales are significantly higher than they have been, we’ll definitely consider it.
We offer the game both on itch.io and stream - and we sell game keys redeemable on Steam through Patreon if you actually want it on Steam and are German.
Also because I’m not sure if you knew this, Steam recently changed how they do ratings on the platform and they include a steam survey that lets you know what ratings you would generate before registering with the official agency and when you plug in any adult content game now with visible sex in it like ours, it comes up with this:
Anyone getting around age ratings for German is either grandfathered in or something changed between them launching and us.