Yeah, my game is on the contrary, very heavy on non-vanilla kinks, I should have mentioned that. That's why I placed so much emphasis on the kink listing, and ways to warn or avoid them.
But positions? honestly, when I play NSFW games I don't even care if the player is top or bottom, I just go with whatever content the game has (there so few of gay games, and even less bara games. Refusing to play a game because it has only bottom/top content doesn't work for me) and I don't even question myself about that, I enjoy both content. Unless the game throws me a kink that I don't like, that's where I start questioning. But positions? I never did.
Maybe my mistake is thinking that everyone is like me. I'm still not sure how to avoid this problem on my game. A comprehensive listing of each character is a no-no, my game is text based sandbox, it has many characters already and with each update the list grows exponentially. I see that this can work on VN that has a handful of characters with CGs.
And putting a big, red warning at the game? If I say my game have only bottom content is a lie. There is top content there. So I'm not sure how to proceed.