Sounds a bit like Wicca imo. Embracing duality and sexuality and being nature-based and all. You might need to keep in mind that Wicca is kinda a mainstream alternative religion. It's one of the first non-Abrahamic religions that people turn to when they want to be free from the church.
I think it would be impossible to sell a game with any amount of actual sex in it (just visual or actually getting the player involved) without a mature rating. Although reference to it is a different story. Maybe some food for thought.
How would the game be played? What genre is it? To be honest a "dating" or life simulation game might be the easiest genre to apply it to unless it's not the overall theme. But that's just from the theme you provided.
I wanted it to be a game that contains Wicca, Shamanism and / or Animism but would convey also the philosophical aspects of it. This might be out of my league as it is only me working in the game.
This is not for profit nor will I sell the game. I do have a fund raising page but it serves more as a blog.
And about the sex being censored or so, I think is lame. After all the concepts of the game likely no child will grasp. What is the purpose of a heavy game like this and censor the sex?
I also thought about the dating simulation, but there are so many out there that I thought I must do something at least original even if the gameplay is unfamiliar.
Would you prefer a game with a concret storyline or a loose concept and gameplay and going from there?