Wolrd-building improv. Game for a smutty land.

I'm curious of trying a little game focused on co-creating a world, region or culture with a certain level of lewdness to it (lewd gods, laws, species, costumes, magic, tech, etc) initially for a fantasy theme but other genres may work as well depending on the ideas.

We should discuss the rules for the game or story so it's more entertaining, some general rule ideas I had are:

Each plays as a dirty with control over one aspect (or group of aspects) and has the final say on those.

Each decision is mutual, for one's ideas the other must add something.

Each one has a character or group of characters that are recurrent or important for the world (may be used for ERP)

Full control over one region or similar  (kingdom, plane of existence, continent, religious group, etc) and compares the other based on that.

Or so on, it can be more free to choosing or more detailed on the rules as to what much can be done at one paragraph/turn/topic, if we start from scratch or build from one or many other sources, etc.

If this is sounds interesting and not just some weird idea to you let me know, even if you don't feel like participating or you'd prefer an sfw/story based version of this, I'd like to share ideas in general.