They think height is a measurement of consent no wonder they rejected it. I don't think Steam was the right place to begin with given how strict they are with stuff like that. Unless it is furry related for some reason... Either way. I think you can sell the game somewhere like Ko-Fi if memory serves right. They have a shop feature where you can sell your products.
Fair enough. I know about it being an option because of an artist I follow has published their game on there along with some bonus stuff. Spicydoesart I think that's their handle over on twitter. But yeah... I can't think of any other platforms outside of Itch that would permit this outside of the game itself being behind a paywall on your website or whatever. Especially since I think this year a lot of platforms across the web have been cracking down on NSFW games and art in general. Best of luck to you, I hope to give the game a proper go soon. Merry Christmas.