fuck steam tbh, they will ban this game for german users when its out no doubt just because they are too lazy to implement a fucking id verification system. At least you can get the game here.
Viewing post in The Symbiant - Gay Yaoi (18+) comments
Actually we have a work out that. The Symbiant will be fully released on Steam but the SFW version only, and you'll be able to get the FREE adult patch either on the itch.io page (this one), our twitter @heartcoredev, or our website (coming soon). We do encourage ppl to get it on itch.io though - for the full NSFW experience without the hassle of installing a patch :D